Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4cc6365768c0ea3…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 21:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 85a06d9f16d51e7cd27236b3a66505be SHA-1: 096099ea86d58facaaeddc8ee186840768b8f326 SHA-256: a4cc6365768c0ea3c305d8f7db8eaad6223efcd7daf0c18186a3accc0f6be661
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous external URLs pointing to various domains, some of which appear to be compromised WordPress sites. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user interactions, common in phishing campaigns. No scripts were extracted, but the structure and URL distribution indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://smidgel.ru/uplcv?utm_term=temp+mail+pro+apk+download PDF link annotation
    • https://lexcyberia.com/userfiles/files/23593307480.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/mabagejelojozapimidojow.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/4744743068.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/visomakokiwewire.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161487654e963b---67558501515.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6ab33bab6dc3400f022391201f0d25d7/funuxirigiravenalakajuzow.pdfIn PDF document text
    • https://asiapharma.la/files/files/11306654857.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/xuwupiwusaziwogazopunu.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/52644257855.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/zebirixokukiw.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/26866693989.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/74163523234.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/9gtru180cd6m90gc9s5ostge00/kimekulavagowuzo.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/7506258448.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/efe6d283fa683c6ae6dfcd39537e7e22/mozelowubikanuwipogadora.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/bff805b2ccff43da7b609ed9050d08e1/91691390406.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/90538709058.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee77b31f6f---82836535750.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/38704262958.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/65554442453.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/toraxidejuxiforo.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16146ee6f0a940---zefomojodil.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/42079982713.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/paxasi.pdfIn PDF document text
    • https://olterus.org/contents/files/47862771482.pdfIn PDF document text
    • 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_off0000d820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD820 10428 bytes
SHA-256: 46b3798421ba64a5f1bd070464fd88ee05f362412f97ec19e3862c8bd8aa7dd7
font_01_sfnt_off0000efb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C3 16820 bytes
SHA-256: 51701ea853210f86753f26c7baeec1ca93adf694643b1a45de39cdbf55c51ebf

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