Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fe1c55da038112e…

MALICIOUS

PDF

141.3 KB Created: 2021-08-05 05:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b0aa3f3e9374e503894538912575d3e5 SHA-1: b03a62eb4ef940396af47f50d88d167b7f8c7605 SHA-256: 9fe1c55da038112e247fd9b3a76e36da67d641518d8f75e9ea980b3d9de2a930
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external files, many hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content. The presence of a 'Download' button lure and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution campaign. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://topup-fight.com/ckfinder/userfiles/files/58619564800.pdf In PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/xotedopabomojufopu.pdfIn PDF document text
    • http://darec.sk/files/files/43121004121.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/42566141023.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/refof.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/71623389717.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/14356760423.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/sipukadenukinevelos.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/vuwowakidu.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4944f038e---jinatejegokejazoxelamis.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/litonukinodi.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/0500fbf912bb0c1aafe524ebfdb7bf12/71514797498.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/nevizavutat.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c14a9071bf2---80972522209.pdfIn PDF document text
    • http://wenxuezj.com/images/File/66577510083.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/fujikewemasisevuxevegow.pdfIn PDF document text
    • http://walkercombsfamilyreunion.com/clients/d/df/dfd517ab040340b2551da60fba195f5f/File/82378036741.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6483c6af3c---15351676424.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/wupoponupizofogepal.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/85247406260.pdfIn PDF document text
    • https://petala.gr/userfiles/file/5598409489.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/61406102560.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857dc1c30c6---pezopulenemewonivuga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=amapiano+log+drum+packs+free+downloadPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00016fa8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16FA8 20548 bytes
SHA-256: 74dec6026ca1e8d9f3529d990d3e31dac84e62acb745d68e7befb300529e843f
font_01_sfnt_off000191cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191CC 14128 bytes
SHA-256: 13ecd003b39dfecff19834dd2a9ba488fee8701a313023385feec9dc0ee02e57
font_02_sfnt_off0001bf4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001d761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D761 20228 bytes
SHA-256: 8c2f4b4a4b9ea4f611729e99df648e7307b168f2259e3772f810e8b553b698c1
font_04_sfnt_off00020c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20C31 11124 bytes
SHA-256: 1560a27e477aa66bab3679a3b19710d08087f6375cca14ed7af42ff7a72d1126

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