Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ae84601e70c1fd8…

MALICIOUS

PDF

85.8 KB Created: 2021-06-28 21:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6a1e392754c4206f453635688c435880 SHA-1: f181f779b0deef30f2843b643f1cb0b78cd1f166 SHA-256: 4ae84601e70c1fd81ca4ea9aabec180713abfe5cc9ba45cf37df8e3797085888
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other potentially malicious domains. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://www.vljainandco.com/userfiles/files/pafotenima.pdf In PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/126e6b097f2daa251244788722c408da/mekunetuxajawameguvate.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/96265317947.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/ndijmptvohn9mi8v3rka1vk7n0/566698354.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/gipusomovevigavivufig.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/12393050661.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096bcd475621---koraxozij.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/kk95i7mk0j6u1giuskhrkpfb05/28935499981.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a79b918980---46779154940.pdfIn PDF document text
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/35010386297.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/01f4ef04ed4e99105d3279c61e09f5ee/filemamotakir.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/a0bf6e6f31e250fcf188e797cbb2c69f/28161887503.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0570c66fa---muzepeveraruvumewaj.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/rvd5ocho2bb3bdiftbgl4g91p4/91686256889.pdfIn PDF document text
    • http://deauville.ru/files/file/81365676701.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/bulebona.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/61737e0373a5d4d4902590ba8bd81dc9/88222741124.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071dfca5f10c---jipadotiju.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/99572877287.pdfIn PDF document text
    • http://macap.nl/app/webroot/files/userfiles/files/xefoledepif.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4702282cc5---73684382470.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/riwusuzatagisuxom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=half+life+of+carbon+14PDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/718ce2c45b0982d7aa377920c7bb7616/58216311056.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_off0000edf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF0 10324 bytes
SHA-256: 1c3cb18c1f7e58e0fce4aa3678ff0d8173264cec7081540b21b393ae2fed07c9
font_01_sfnt_off0001054c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054C 17140 bytes
SHA-256: 6a3bb7e131046be3c9ca1094daab7c5b213058b385b43872e3b77baaeacffc52
font_02_sfnt_off000131f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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