Malicious PDF — malware analysis report

Static analysis result for SHA-256 a516dcd155fab616…

MALICIOUS

PDF

79.3 KB Created: 2021-09-01 12:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 16c808db8dd4f6fae581149c0479873f SHA-1: bb661e4effd670b33299b390df5b0fa07f683dd0 SHA-256: a516dcd155fab616e14e6e06125643b7d77e16cd4bf43cec2e2de076317b661e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also functions as a link farm, directing users to multiple URLs hosted on potentially compromised WordPress sites, which is a common tactic for phishing or distributing further malware. The presence of JavaScript suggests an attempt to execute malicious code upon opening the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726ea417d94---54421836875.pdf In PDF document text
    • http://timeyear-v.com/userfiles/file/99315894718.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/75bacfb0560f35bd7857ff3e9d74fb41/13709323301.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/44640726521.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/0ce96a779c2195e979e91b07994eb2ee/revuzofive.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/7070a4283a2c0a8da0c8dd865f4a0280/zilixixewemapajexebiva.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/toduxewejizuvovalovejun.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/12560670041.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/56606533568.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608a22215c227---90876257277.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/34536151034.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160a60d6876de6---xerixabenuzib.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cab70b3473---wegunurejesixevobafowigup.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/42823462446.pdfIn PDF document text
    • https://promise-land.com/upload/file/29951985180.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f351e1766---xenam.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/damaw.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210817142839.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/7143c714185208d98d39050ea3fc6d35/vosus.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/75475757449.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/ee9526287f64f61f0949aa49daff3428/91248284026.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/92327502827.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/zuramudanasegaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=somewhere+over+the+rainbow+andre+rieuPDF 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_off0000cfa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA2 17520 bytes
SHA-256: e419db9c745f07cfeb52f304d7c3b5243380ed4f5f8f8f5f1f34faae795fc68c
font_01_sfnt_off0000fd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD90 10764 bytes
SHA-256: 2591daefac88016184f276a7436d2a5e60ea8c8a6aace6f06e9cbc7aeab03431
font_02_sfnt_off00011636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11636 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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