Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbbb3927e983b757…

MALICIOUS

PDF

75.8 KB Created: 2021-09-07 04:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 9c6a631887e215101f309bbd94a85415 SHA-1: 5f945aca084252998c817a83f1f9f246b4eeb334 SHA-256: bbbb3927e983b7575125c3c1408ef21bfa32e1fc1445f44ffeb194aaad49ef7b
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://ahkjt.com/upfile/file/73754061706.pdf In PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/29068496500.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa3ddda97c---wasamoni.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/060cc1dc0c53bdb293fa4bb50c4cf84f/61940965236.pdfIn PDF document text
    • https://epiphanych.com/images/file/pelem.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/e315ceeb2bed97b976b9a3df5dd78927/suxekafowuzelivinoke.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/e89da50ea40e2bf02063908b3e64401f/16898309501.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/pedin.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/65973e1dcdfbd4960b65bbad55f64957/40379194912.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/81416862225.pdfIn PDF document text
    • http://askort.pl/Upload/file/jagatisutiwidisuzun.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1623782072.pdfIn PDF document text
    • http://donationwebsites.com/clients/6/68/68901b9e08e997a22fc64c74502b39ca/File/tuwevofifiwubi.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/ha8cg33nmka76r378qk4mpantv/93576916983.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/bijinimapiganemoponipaf.pdfIn PDF document text
    • http://airsoft1.ro/files/file/gogavewubirobu.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/dusomilupatudenizewa.pdfIn PDF document text
    • http://coffee33.ru/archive/file/jakaxesadivukedemavuvo.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/b79097bd6063738e4db384f85dc943d4/tevijafat.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/4433420738.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/29083651522.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/95332691328.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/45775665327.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/d9b7349a1710bd906f7e37ecaea005d7/79521626577.pdfIn PDF document text
    • https://robodom.si/files_vsebine/kuzerameleduxanim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=upsc+maths+optional+books+pdf+free+downloadPDF link annotation
    • 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_off0000c044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC044 17980 bytes
SHA-256: ee987c71805d27e862071265efc4e4fb3a6c08471e426940c77a41125e116524
font_01_sfnt_off0000eede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDE 11208 bytes
SHA-256: 857753e8bef5aba43835aa3cae401eb820a98ed3d53da1340b282ae7723a44c5
font_02_sfnt_off000108c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1