Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e9162b33631ac6…

MALICIOUS

PDF

74.1 KB Created: 2021-09-14 08:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 693803c088a2a4c5ce57fd3768acbc92 SHA-1: a2ba4762640c6b80bf9cf00cd63288a4ec81c7b2 SHA-256: 31e9162b33631ac676750c25f6921540290690391dc7dfd9e6be752f6d7a4cb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users through these links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://huntic.ru/uplcv?utm_term=need+for+speed+no+limits+hack+apk+android+1 PDF link annotation
    • http://daisytalavera.com/userfiles/files/vapagerezet.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136aa8a2935e---senemefiketewutezedit.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/jamewobazibosalekozub.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/moxewumomarixu.pdfIn PDF document text
    • http://beta-rc.com/upload/files/luvulirumulajexuj.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/wiliwagorome.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/5837b7cddd07e86e9eb3b8d74c0974a7/33540907206.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/77646743690.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/3730714bf89812303109644e31772c17/23260974949.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/33280524765.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/9353222126.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/87202094664.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/vivofanaxure.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613952f67a6a8---lopijisajadodogevu.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1631529219.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/7452839070.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/86579988579.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/fidemixikumevib.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/c95b8375032de9ca745c46c513c554f7/27113650846.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/45281135599.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/72922634473.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/gokif.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/pefeberigifupel.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_off0000b892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB892 11008 bytes
SHA-256: 56796a06f08efcfe676b25a6d3632dba4d02c90099ae7cb79e8ede93b30fb27a
font_01_sfnt_off0000d1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FA 19000 bytes
SHA-256: 02d20e6e31cb523f4a5a21be43fe7c94a0aa275012a669419d09af57a5bc74b5
font_02_sfnt_off00010229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10229 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1