Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c08b76eb8011a70…

MALICIOUS

PDF

95.2 KB Created: 2021-09-06 03:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 03f2b271781cb73c34567d1c63d2c540 SHA-1: 7a330cc4d7092cdba012bfea7b0290bdf43ef280 SHA-256: 3c08b76eb8011a700d969981947d01ae268fa7969a1d4630646aaca022b878d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The file contains numerous external URIs and points to compromised CMS upload storage, suggesting it is part of a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is used as a lure, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 https://allytemp.ru/uplcv?utm_term=giving+sorrow+words+pdf PDF link annotation
    • http://kieryk.pl/img/userfiles/file/kapititugidesi.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/97831648249.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/zobiwixoxosif.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/74c378e446df849cd55b01af6bac45ca/legolunarovodot.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/t6idlbvlo85l7galqne1m2q9go/13300503453.pdfIn PDF document text
    • https://avvocatoboretti.it/file/35943775566.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/pemunara.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/g6u8n4u9h0cqv3qij2o53r65mo/83723932668.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/ee6ebe7b136565a47ee33875f3e79350/sifidinumiz.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/56734487055.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/pogabijurotapiwidu.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160df7dcfdcc2f---fibufemi.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/kc2onbfic0fcogpbiv1sjutg92/68607445525.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/piteketivijizupuba.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/56053613969.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/1cb2e51d1cb7ed7e12bb4954acbef33b/93929945195.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bffecd367a1---vitatabup.pdfIn PDF document text
    • https://rm-parketi.si/uploads/runaguj.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202108/file/kafiwifuborigixigisenafa.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95308e28bb---giluketi.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/fefasirub.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/34615273827.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_off00010f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2F 18848 bytes
SHA-256: 34d8bab1a2f308a2a8f9f63d3bb51b86096cb77f582d62bdb9a720d91a4d1974
font_01_sfnt_off00013fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000157ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157EA 10428 bytes
SHA-256: a5b484ebd3baea9faf5c69cc2b50089059942bad1417f30479b7d40c50aa374d

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