Malicious PDF — malware analysis report

Static analysis result for SHA-256 316af95e1da1d0e0…

MALICIOUS

PDF

80.8 KB Created: 2021-09-21 23:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0ed262c324fd1f765ff39dd7556eee1c SHA-1: 0b5b201f0177de9eb2e68e767c0460548bfb7223 SHA-256: 316af95e1da1d0e09f0b8db1c700da7389555947feee9d69973b38b6566fea43
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs pointing to compromised WordPress upload directories, indicating an attempt to host malicious content or redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this document is part of a link farm designed to distribute malware or facilitate phishing. The presence of ClamAV detection and ML classification further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=spoof+pokemon+go+apk PDF link annotation
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f854b017e2---rigumom.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/78511e76db373bf6d664b4a0c3696f95/nexogiwu.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/77182016244.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/boxaxonuxaxolib.pdfIn PDF document text
    • https://kuepancong.com/contents/files/88542173534.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/desolidorum.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/71078827465.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/44360044382.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/70781889868.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/69536278744.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec43387425---kilekejobogikasijuferemi.pdfIn PDF document text
    • http://theponghop.com/upload/files/pekufirosewowusexosofegu.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/nq205b3ujlst5ikkf369ipqs3b/84986799758.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/vigedufip.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/sulevebagabozijuvuzi.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/141728439329.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/jipofuvedew.pdfIn PDF document text
    • http://denizyemek.com/images/fck_upload/file/volidajibovir.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/31055748246.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16148db1c5bc83---jitoladixitelisukida.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/13428923283.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/vunalopamewu.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/5956d423f77e6e41766cd6ac9c60683f/69440691707.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/38061406634.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_off0000d34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB62 10364 bytes
SHA-256: 77b9c5898a9c638a32f3941b121a7a958665a168d3291c6aedc744b8bff7fca9
font_02_sfnt_off000102d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D1 19768 bytes
SHA-256: 26cd2ae108e918afeb69010ab8de1eaa13613974b4aca9c6ff5c23ad14944b40

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