Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5fbe2fc22fb76e1…

MALICIOUS

PDF

69.5 KB Created: 2021-09-27 04:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4cac86e2a9eb7e377aeac3d5a30a8286 SHA-1: 99e47cf0db2e44ba0632226aea9ee1da391f1781 SHA-256: a5fbe2fc22fb76e1f64b5c8a6bdd998ddadee5a08e517ff7e5d1c46413c154ba
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It is an image-only document with a click-outward action, designed to redirect users to various external URLs, many of which are hosted on compromised CMS platforms or disposable domains. The presence of numerous distinct hosts and UTM parameters suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://inwebjor.ru/uplcv?utm_term=instantaneous+rate+of+change+calculator PDF link annotation
    • http://greathorserider.com/ckfinder/userfiles/files/tisinisewixomaramitusig.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/55295120091.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/mamogiteji.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/228385f97271a442c71258550f7bd357/28723576763.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/jizidonobafosubujovezow.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/xirilag.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/pejine.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/kakekiwujovelasudirolilat.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/81086981712.pdfIn PDF document text
    • http://merwepizza.com/upload/file/suputuduruzopagi.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/pegejijobizezof.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/19651356840.pdfIn PDF document text
    • http://yljczl.com/uploadfile/20210922170921910.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/j792l91rdndeho2ufhi9i9gsfu/73844594528.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/15562662971.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/94604283358.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/64979266430.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/pegarogujewi.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6eb61cc40---48184214916.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/gufifapejejijazofakagud.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/83849187296.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/jenenepelivipubugate.pdfIn PDF document text
    • https://rozynoklinika.lt/userfiles/file/751617516.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/gokixuwokamozilujuzel.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/bobewakatavakukowef.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/xadimari.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_off0000b51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB51F 13880 bytes
SHA-256: 6d6b3dadfd3fa3a15069f98a4da0e509d382b269a47586c0e1900b56677afa24
font_01_sfnt_off0000d77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF93 10576 bytes
SHA-256: 86b09b14d0826549288dcd178c976b07a37e0d254e668e3dd44102b0d49fb6ce

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