Malicious PDF — malware analysis report

Static analysis result for SHA-256 243887b557619f35…

MALICIOUS

PDF

62.3 KB Created: 2021-09-05 13:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8a4a0b81297f43d72b1683deb052989f SHA-1: 17f18752faec7993bea49769535f8bd982b26e96 SHA-256: 243887b557619f358237373868edd5ad4444f4af5cdd0d89511cf09d3124eec1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's used to distribute further malicious content. The document body is heavily obfuscated, but the presence of numerous links and the overall detection profile indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6689

Heuristics 5

  • 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
  • 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://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/bc267ec1b68bce726d7678e8780e5310/16369310910.pdf In PDF document text
    • http://sake2metustin.com/uploads/files/nemopal.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/xinuzuf.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/bonudukorigenerul.pdfIn PDF document text
    • http://skupka23.ru/upload/m/gunomiwejowawekewomiwep.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/1ebc3ed18a01f435608fca83ef7bb9a5/xogobudokinasasa.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/b226ce1bd286a7350335b5911d463c94/30800176723.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/63403199216.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/88470170603.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/77f1c3a6bffd293f468a01d9591691e7/12620816100.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a998c977dc7---pewivetudewobew.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/dufulalulilefesiwuvef.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160b7688cbcc2c---zizefurenevavikijozogin.pdfIn PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/77764902813.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f6d46e14d79---puvenoro.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/448e23fb16a61751bfb3e636761117e7/94249746645.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/12275488807.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/dadefetale.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/23d0e80047a730095078184718a1bbf4/75729729474.pdfIn PDF document text
    • http://simonide.org/userfiles/file/kakojawebekefipifuxudawa.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/c57aae4179341d86be648fb5b4f19747/10054095353.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/5tr561vfc323mekqt15vn35an7/41234003912.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/98669618454.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/9930813736.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/70607435147.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/4cue5f8d3gg6oc3p4shvug0d02/pakejepedopejelal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=income+tax+challan+pdf+fillablePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0CF 15740 bytes
SHA-256: 85fc2a3d7722be04c28e29058a95a97e668d6df64ec229ecbcbf2fa02820a984