Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab67978d26ea6fb…

MALICIOUS

PDF

114.8 KB Created: 2021-09-02 02:34:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: a94e2049400782fde72fb9ade341c985 SHA-1: 88cb91d0a0217e1b9a0e919ba52ca3185558aac1 SHA-256: aab67978d26ea6fb9a3e9a07f5d160ff483f9cd2ad2c0a4dfc402a4a71d62290
236 Risk Score

Malware Insights

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

The PDF contains multiple links to potentially compromised websites and uses lures common in phishing campaigns, such as offering a 'crack download' or instructing the user to interact with remote support tools. The presence of a password-protected archive lure suggests the document is designed to bypass gateway security by encrypting the actual malicious payload. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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 http://kuhomania.ru/ckfinder/userfiles/files/3570875194.pdf In PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612d4d11d0672---67633485056.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/p7ch4m9u7sl3bdicpk567i0j0t/bedodadirememomokojutug.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/xafaxirezen.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/riwejofixafimawat.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/90387425064.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/29626885050.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075a1a40ecc8---rebupuvebuvurijepipi.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/30019465241.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/8ca6f8a6a9b4a6f015511688255e8af1/xijiforumo.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/subawulefizon.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/41170521131.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/cra0faoggum9bad0n0e1akio32/fifumavetino.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/54222774697.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607544cb203aa---35515879625.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160770755cd115---zawotikivuvaluzoxidig.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ed0d9a0d7---94924455560.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/cae4832342d89a7e3defd9f6a08b4daa/gawuwazeravenoduku.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3b5c376820---bolivedupobinawupevukubev.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/57117782436.pdfIn PDF document text
    • https://flyfinz.com/userfiles/files/67745765447.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/f431q7er19ngm4dp5ok210jjo5/17097916734.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160888e03d8a4f---12544933823.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e83b12527---38789535246.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085eed3276a9---gupazeteme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=miracle+2.82+crack+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_off00014d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D3D 24616 bytes
SHA-256: c959ec4f6000270905be644c0ce02e375ad87127521822498482ffa572be9f8f
font_01_sfnt_off00018c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4B1 10660 bytes
SHA-256: f34b9f596668806cdddb998cdc150903acbd3347ffd137336eeda34140536e7e

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