Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b410bb3a9c7470…

MALICIOUS

PDF

82.0 KB Created: 2021-07-29 17:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e2baf8c7a0279c20bd277b37b1ba0b9 SHA-1: 8c5483414cfb2c64dd5f3c5ee847d8d612c4eae8 SHA-256: b1b410bb3a9c74702f37b665d0fdab035f539099a291dc3da745e686405801fc
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness, identifying this PDF as a phishing trojan. The document functions as a link farm, distributing links to numerous compromised websites, likely to obscure the true malicious destination or to manipulate search engine results. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://abwrichmond.com/uploads/files/33917928171.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16079996212e92---32584539341.pdf
    • https://shoppingplanet.ro/ckfinder/userfiles/files/90781678839.pdf
    • http://gocep.org/data/userfiles/files/70412137365.pdf
    • http://zaintik.org/files/galeria/files/3959872386.pdf
    • http://caydinhlang.net/userfiles/image/file/30873501874.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d12e04a1a---7902784926.pdf
    • https://chiataiec.com/userfiles/Proj_Name//files/domubi.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9cadafeac---bededubazaxululopuninoma.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/k6tkii7lbhp2fefespa08aj7jm/67102859297.pdf
    • http://casaatlantida.com/userfiles/file///numeg.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/3518e2e9d29ee0f2ae53671d6d2b45f2/numidezenutojuvakuw.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/uafq0k4kcmutb38i8rqi367nob/24585159876.pdf
    • http://cdmvt.cz/sites/default/files/lugafipogetabonidajulono.pdf
    • http://dentherapia.hu/files/file/lurojofupitog.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b99688127---69906784388.pdf
    • http://akcjonariusz.com/UserFiles/file/libuxoriwazubado.pdf
    • http://akcjonariusz.com/UserFiles/file/gizoranerefusadabugorujo.pdf
    • http://alt-1c.ru/userfiles/file/67416291783.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/27b809f0f40f18a70e459630c2ef3ea8/xexekajebofu.pdf
    • http://piau-po21inn.com/CKEdit/upload/files/reribedagidokoreruti.pdf
    • http://www.gesas.it/media/mailinglist/file/81657373755.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=mitosis+and+meiosis+multiple+choice+questions+and+answers+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_off0000d8c3.bin
b78f342ef048d5185983d4dac45ca3c45cb1cb6f845b333f68352fab4bae05d0
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C3 11208 bytes
font_01_sfnt_off0000f29d.bin
4f46f9af669bbb22f3192e1728a9f19b083dae40402c0bd7755a14ced66c5b9f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF29D 17888 bytes
font_02_sfnt_off000121aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x121AA 16792 bytes