Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d1ff7bdc953dfe3…

MALICIOUS

PDF

85.2 KB Created: 2021-08-09 00:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 813b4449a5e299cd941ca20cc23de632 SHA-1: 8fed18babfb295e8796235f3a459d33a24d108d1 SHA-256: 2d1ff7bdc953dfe3774489801c59fe093c0efb76584f4ebdd259646634c7f7ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URLs point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://catamma.ru/uplcv?utm_term=atharva+veda+in+sanskrit+with+english+translation+pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/aor70l88ulcrv9ksj9unp30mq8/36872126913.pdf
    • http://washchienluoc.com/upload/file/68016033844.pdf
    • http://clubesquilacoma.com/uploads/files/46661635625.pdf
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/14c8a36ab8ee75d27889ddb6f342f72b/futirufed.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/8pdpjssdq0s5b8q7pa0if9vm97/67058962390.pdf
    • http://hzjksj.com/images/upload/File/9019836828.pdf
    • http://canphantich.net/Images_upload/files/zedimidaroxukow.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe9259d9da---rosagojewupikemog.pdf
    • http://kulturazebrak.cz/userfiles/savilelagarojege.pdf
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/15087439564.pdf
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/99423942869.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e526cb628---vusamejijoberojoza.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/98e1a9074616ed2cb8cfbfed49ce3ef8/wilurodesotirazidinewewej.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ibq2c9dv0taoe9rg8129c1h72/88640384181.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dab41bdaeb---25049733211.pdf
    • http://c2r-auto.com/uploadfiles/file/2021062019044073499.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/8o7l4o365r9j6rul586umctf8t/7995376023.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0f95c2072---60289746934.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c515861033e---75721813758.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/7d143f36690da744c76ab5f5074bc6a0/motudosis.pdf
    • http://apexibd.com/uploads/fck_uploads/file/pesiv.pdf
    • http://hcvitamin.com/webroot/img/files/xunarak.pdf
    • 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_off0000e920.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE920 16792 bytes
font_01_sfnt_off00010132.bin
577cb6b472dd8c178170a67e9295c2860094b5d0ecadcf21f02bc126abf5838a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10132 16720 bytes
font_02_sfnt_off00012c90.bin
09fdce9cc1195058c89aa23ba0c935dc73b7f34a5147b6ab8385cbeba74f9dd2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C90 11004 bytes