Malicious PDF — malware analysis report

Static analysis result for SHA-256 645b7eb22ee1a902…

MALICIOUS

PDF

81.9 KB Created: 2021-06-26 05:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0f11262fed194ab27c620509b4e84e46 SHA-1: 826d657dcc9a757af159e5378c8328a2c69dbf6e SHA-256: 645b7eb22ee1a9028fb27ce632d07d58f28339c614c6afd6883380b74eab6f80
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits multiple high-severity heuristics indicating malicious intent, including linking to algorithmically generated URLs and compromised WordPress upload storage. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan delivery mechanism. The embedded URLs likely serve as redirects to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dolmalatrek.com/userfiles/file/38235818040.pdf In PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/naksm075bptg71g02ecpkmavj2/55747480211.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/36376413012.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a9ff85934---zimulekepuguwijatok.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/e051f5fc82d37e6d3d8b2a672199360d/56749166373.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/62f161283c101babbeabb1d20eb265de/19400301041.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160af7238b8981---26249341652.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/7a7946376d4e55d5b8cc69d8949ba484/zadomogawuwokoman.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160711f9dd9465---miripafoxorelevur.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/82e9badb2c3272471a0a534b29676e0e/36134140806.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/mimikotobapakasevuwe.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/bdb2b2f1c9cccb6a3b0d3b026ffb908f/negiwovulajozaderakivi.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/0265dn7h178aqqorf4c20g1gfl/xamoforivesapugevagodifof.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/3a2942fbee3dcb6249a822d626b01e38/29939703300.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/dubewifipamoxadarik.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/221770d1219509192476ea321efeb0b3/bepipokop.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/pepesebamimurutefunobo.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/3i9oquetvnc2a69fitubea3hg7/43753544840.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/93712904c0eb09e7b6478fabb75fa120/pavufurafefejumuwivesuv.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b03bcdf624---bobogeliwebubi.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c40fdc845---23723162356.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/74791456579.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/zifudunaroxamekuroke.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/fg1nigvee83mgkinedmfal33b5/37426606477.pdfIn PDF document text
    • http://szrealty.net/uploadpic/2021-5/file/2021052902484873499.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fabfa58cd0---23820231863.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=i+little+help+from+my+friendsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF55 16884 bytes
SHA-256: aa351ea1f831e540b480c5bbefbfb1c49fdddbe2fb1f2b089c570c9d736edb24
font_01_sfnt_off00010a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12258 10664 bytes
SHA-256: 9237a6007efbd5bbe363defbbf7cce9e96e0f9319f24c3baafb2dc3400077a46