Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a62ba797003f45b…

MALICIOUS

PDF

75.1 KB Created: 2021-09-06 22:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1033253c0e5319cf7ba068d50b80d483 SHA-1: dec626bff78c01926ef43f6e8b4e886adba0e1f5 SHA-256: 2a62ba797003f45b036d9b594128d46e293aadc68cc151ecb8ef6405895232f0
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm and contains numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS platforms. The ML classifier and ClamAV also identified it as malicious, likely a phishing or malware distribution attempt. No scripts were extracted, and the document body was unreadable, but the presence of a link farm on potentially compromised sites strongly suggests a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://kondicionery-domodedovo.ru/upload_picture/file/849503851.pdf In PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b242dcc9d48---56086887681.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/6976450662.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/9382168028.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/gexovanawirarimexam.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/rewuliso.pdfIn PDF document text
    • https://flyags.com/editorResources/file///47948413726.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/2080909070.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/q3pc3qm1q38r3sju2ouggplib6/54794922801.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc8e58db14---84539857054.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/81843364945.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/148ce51dc27e6c953b9d6f74c49b5058/tutolabiluna.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/zifevaxiwerulelugevu.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3fbc4db28---67048507286.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/48303784798.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/xisibevidivemuzezeg.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96e95e1db7---pederofelifil.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/xezevimogivimuvimago.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/kubada.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rijivetijoderor.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16123774814859---nugilivu.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/rumumominuwukabuza.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/8883083464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=us+polo+assn+watch+us9058+manualPDF 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_off0000bbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBCF 11140 bytes
SHA-256: 6a83ab66d4be3a7bfa630450669f0f775a6a362077649a220cf4c1786ec535fc
font_01_sfnt_off0000d5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDC 18428 bytes
SHA-256: d3fef490dcd82de29e98ed127ed43b1e7f91a98952a78e754bbbb64eb2ac82ac