Malicious PDF — malware analysis report

Static analysis result for SHA-256 016badbae91cf9ba…

MALICIOUS

PDF

85.7 KB Created: 2021-07-01 10:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7755ddff645bc9713a13d5524ea3b8e SHA-1: 17f2a6c0ff945f1c917686354e45628f8b804967 SHA-256: 016badbae91cf9baf35055fbb727ac39f047c909182edc20cde31f31e37068ec
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://retta-bg.com/userfiles/nugapokufofaxabutujobulok.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/12jfktsmq86t6aidnasec2rjg7/sobidevenorotenuxijeki.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8a64dbfe5---linodapixigo.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/0a41403e506bbd48c6c56ffe54cd9236/wiziredoduxofujazu.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/4578870eaf30e6c18d20da14a23f2f72/weludezes.pdf
    • http://assistance.uz/images/shared/file/ronomizewowetozisavusulaz.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/k93fugc3jm16ndu6tc9u9tvfah/nodemoto.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c00b80670---ziwifej.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/tdgvbn119j6luq6f12ao47upg8/5851508530.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9f6482dc3---rakudu.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/e5940ba93a5a22f1ba1a75f26f5b291d/mudevikam.pdf
    • https://cargobull.cz/res/file/98557078724.pdf
    • http://cephedanismani.com/images/pages/file/30297208370.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a850213009---17402938690.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/k3ulj8bj2jn2ciep4up1nfqcfc/35890197606.pdf
    • http://cn-junsheng.com/upload/file///202153071216225.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949ed075149---rivuvaz.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/tos6reus20dprjatdjdbupa4dp/53929760923.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/2d1605730083c25459b9655c0c9b11a7/rulazipobiguwikomogak.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/adef5d636d4a2044be651e27f078380d/30326269232.pdf
    • http://unsersohn.ch/images/file/jeniba.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607097fb35eb3---mojipalozufojojo.pdf
    • https://al-farh-iq.com/upload/userfiles/file/bufoluviki.pdf
    • http://mispuntossaga.com/campannas/file/tefebiguxutejefejemewuzi.pdf
    • http://eko-inwest.eu/upload/file/73637964199.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=canon+in+c+notes
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e561.bin
f94b77d0c43cdbdd9141a367edf51b9395b1418ba0f55e03978ee165d974ba26
pdf-font-stream PDF embedded font (sfnt) at offset 0xE561 10108 bytes
font_01_sfnt_off0000fc20.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC20 16792 bytes
font_02_sfnt_off00011432.bin
addbb3abe125681c65a5ede8b9374e69c5807a7d918781554903313fb860c407
pdf-font-stream PDF embedded font (sfnt) at offset 0x11432 20120 bytes