Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dda1e9bffae56cf…

MALICIOUS

PDF

109.2 KB Created: 2021-07-04 23:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2c977fb5af33a2bbf2aa98c9ddb6efa4 SHA-1: c3d53c299048284a045aa98e886f384258bb8ddf SHA-256: 9dda1e9bffae56cf2f6bcdb8f8401d3f9cc6f7b7924ec1ff018b123f6ddc22e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards an attempt to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://allytemp.ru/uplcv?utm_term=civil+engineering+competitive+exam+questions+and+answers+pdf
    • https://internationalmedia.com/userfiles/file/gumafe.pdf
    • https://maplesservice.com/wp-content/plugins/super-forms/uploads/php/files/ef4d36367308d75a962a9c54e172c7a1/tavezetekegomuliwa.pdf
    • http://alumcity.ru/userfiles/file/96655626001.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/a1608cd9877007efadf27299bb670214/94651878160.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/6f8a717b2ee1ff4b1891c399e718dc75/47116425383.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/d72iti2d8gmk904kupgt4gimea/roniduwegivigibisodox.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160917a6b7eb28---14287957359.pdf
    • http://faradbox.pl/files/file/67703238117.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/efb1b08b544c23f0d9f11334d36bb90c/80412895907.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b06cf514077---boritatalamatuxeja.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/plcj0a8603jc1muds7gij865l7/bolirafosiluvavabediji.pdf
    • http://suachuaspa.com/upload/images-content/files/papiteguxatekubinorikevo.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160beb3f65012e---36078019377.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e054b79e1---66573750711.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890dba57226---98020387940.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/aqgj2hoipnika8foh7hibipnfr/76194818711.pdf
    • http://baohanhranghm.com/upload/img/files/marega.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/34ea4fb0fa77fbe69ac40616b0384efb/pomumevariwe.pdf
    • http://e-kva.ru/admin/ckfinder/userfiles/files/gonikovomuzomik.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/eja5e0tmmc8rik6g3b04sorrq7/bisukiwuze.pdf
    • http://kcde.kr/userfiles/file/zinarodajexizemej.pdf
    • https://bamfieldrental.com/userfiles/file/15810953976.pdf
    • http://crosswaysrecruitment.com/userfiles/file/59053565731.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/1cf0c7e69137af8e8ccf96ebdf387a5e/3066905059.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_off00013dd1.bin
f51119c03e0ae3cc3bd5a354621bf0364b65b83697f143ba290d36b1ed7c99c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD1 19740 bytes
font_01_sfnt_off000171cf.bin
63a3914fc4e6b650854c208d26212a446b22c8a9eb84328993538ab51d1ce900
pdf-font-stream PDF embedded font (sfnt) at offset 0x171CF 11492 bytes
font_02_sfnt_off00018c9f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18C9F 16792 bytes