Malicious PDF — malware analysis report

Static analysis result for SHA-256 e66f1eee8917f7c7…

MALICIOUS

PDF

82.9 KB Created: 2021-06-25 16:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a34d39b8e8768254d4d2aa57a4e318b7 SHA-1: 23f8d74d89e57ec32d909cede5c04b6bbfbf44c2 SHA-256: e66f1eee8917f7c7b5608852c4048f338006dcedc8c621539dfc3e2dbb7db05b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm hosted on compromised WordPress upload storage, directing users to various PDF files on disposable or potentially compromised domains. The primary attack pattern involves luring users to these malicious sites, likely for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 https://nestaerospace.com/uploads/file/25742568851.pdf
    • https://aihr-iadh.org/uploads/FCK_files/file/wikelo.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a177e6d3a48---moniginanulusarewiv.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/8u7g3ro39s0tc39rbjt1i0fi05/gafivutenug.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/a1b99900390796f3d9c9b419349f5b14/61936170648.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c7bde44d8---32754099751.pdf
    • http://murasakijr.com/uploads/files/80591204812.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a8ba91cb1---jetefomije.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef55eb5c20---47446571951.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160984342074c1---83113261544.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/eab0352070be10bff619185b55b36e4d/jusomuxupadamol.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/60e0ke2i5lgpsc6hnvse1m7pd2/vulapuviborofupuxumaz.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/816e27d1597c169aec214c7e57ef4052/21820762781.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16077bf244daa3---xovowojuvujowevunujazele.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/5osodonv3kiep9u16ulkmrsim4/vojakipumupesodin.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/673aa4e922be46466baa1506d43332ab/53141696600.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608271e08d8b8---kazadubaxasepafuxote.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=baked+chicken+fillet+with+cheese
    • 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_off0000e40f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE40F 16792 bytes
font_01_sfnt_off0000fc21.bin
a4c9238adee0c8dca6f180b669d1796ff83be9ea31332bc89478820ae42d80be
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC21 16560 bytes
font_02_sfnt_off000126bd.bin
8bf57bd29ffce3f3412602e51b24dd906076d7541c58a7d8f9290e9d373e6279
pdf-font-stream PDF embedded font (sfnt) at offset 0x126BD 10584 bytes