Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae0a30a1d6b1f6e…

MALICIOUS

PDF

85.5 KB Created: 2021-06-30 19:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 74f830bcc37ddb087923a626f6ff4a77 SHA-1: 93eb9587e4cc7bd485fd00f9e04e8c608781680e SHA-256: 9ae0a30a1d6b1f6e3df262501b6b1bf382aef5e09fe297ca792306b482c3a8d0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's used for SEO poisoning to redirect users to malicious sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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
  • 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://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609316214d4c6---47247459451.pdf
    • http://brandnewgoods.net/userfiles/file/momopowefabemenidazegig.pdf
    • https://unitjaya.com/contents//files/supowovipuwib.pdf
    • https://anandamsanyal.com/userfiles/file/pusojusivazetof.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-4-30/20210430094559652453.pdf
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/waxitubavu.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16074a47b21f92---3555042836.pdf
    • http://fapannimario.it/userfiles/files/zobezazuzovarizifagumezud.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/2b1924bf353e6deffe59788a6955a883/26604370009.pdf
    • https://liniagdanskzydowo.pl/files/30090735923.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be08943ac6d---40500745781.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085afba1a1c1---58577873577.pdf
    • https://medtek.vn/storage/file/tozowir.pdf
    • http://wsp.pl/userfiles/file/27530072842.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/6eae511d24550920a7b887fe7b38efdf/4974015118.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/7ff46a4b7674760193ef1e1deabcddc9/lunufevorodobikolux.pdf
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/79791027948.pdf
    • http://toonesk.com/upload/45250176695.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7de3618ba---lunalorarar.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b6ff8a5b9---lolib.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4526946c3---82840931446.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/hp8u0dn1k6t14guqvk334e92c4/xozutimajejodexovixis.pdf
    • http://duancanhotot.com/upload/files/90435603037.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=free+robux+without+human+verification+and+no+survey
    • 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_off0000e9dc.bin
99d8f1d756786e6ca2ab5e2d5deaf0cce2c46ae3ef6053ce3562e65b6083c659
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DC 11280 bytes
font_01_sfnt_off00010446.bin
4be3fb6f7abb6588f1880c538e9371c640fd310310152198052a793b4e8cb154
pdf-font-stream PDF embedded font (sfnt) at offset 0x10446 17056 bytes
font_02_sfnt_off00013073.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13073 16792 bytes