Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6666d6a6584dce4…

MALICIOUS

PDF

83.7 KB Created: 2021-08-23 13:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 66bc86646b9908021cc57fa1f838397e SHA-1: e38674382cbac88c8cdb6b038b4ddc1d3fc36fe6 SHA-256: d6666d6a6584dce4238a82afcb390874c3b23b31696e281192d76944b615c05b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm or redirection scheme. The presence of embedded URLs and the overall structure indicate an attempt to direct users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=how+long+can+chicken+tenders+stay+in+the+fridge
    • http://akinmedikal.com/uploads/file/gopivuziwukolone.pdf
    • https://harvestrain.com/wp-content/plugins/super-forms/uploads/php/files/d72918dea781ed903194e2b2cee32b62/31815113770.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/f40sfbaoikmquqtj2omhtsapqb/20408782028.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/p7eqekvjcev7eh8v4vs8mct684/37749646625.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/r56m7gqftdb2fkmnvb2kq5d1h7/kizuginabokixogurajib.pdf
    • http://techscreening.com/userfiles/files/16062507915.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6337300fc---48474516149.pdf
    • http://tucholainfo.pl/userfiles/file/wisosokidad.pdf
    • http://asupuro.com/user_data/image//file/polawalarezusa.pdf
    • http://architects-desk.com/uploadsfile/11574896480.pdf
    • http://bhs-class1957.com/clients/35434/File/13981126965.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16077688c56472---29933574507.pdf
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/359d9c368eacd90c07820e21c31a0506/nurotozok.pdf
    • http://stacjaregeneracja.pl/userfiles/file/16248650886.pdf
    • https://www.asoriofrio.org/ckfinder/userfiles/files/wiveguko.pdf
    • http://demkapi.com/resimler/files/66852446652.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098445fa1f6b---bomisedinugapubexufupe.pdf
    • http://alkanboya.com/files/file///tametuvepimototuzibu.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609580c3ae8a3---43760015372.pdf
    • https://parfumzone.ro/files/file/55587047429.pdf
    • http://eunlocker.com/Images/Editor/file/jizikozemuwidekemudu.pdf
    • https://istanajp2.com/contents//files/69895109501.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/76f07b424e05edf4be5a3fccca0aeac0/jeluvusexupamaj.pdf
    • http://childhood-matters.com/clients/49507/File/36389795243.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf711b00b7---40622137843.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d5fbd8794---fovalukasigujebugefujev.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079f40d292dc---valapojagubodewidajis.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_off0000e02b.bin
ff48c90811489b66195e947794b60a9782001c6c4ffd57731df5845fee190e0d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE02B 11040 bytes
font_01_sfnt_off0000f9a4.bin
736a5ef5fbd4e9f42fbeacd2076b979d6649fdc4a07e71b2fc17ce2116bf6ec2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A4 17512 bytes
font_02_sfnt_off000126e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x126E0 16792 bytes