Malicious PDF — malware analysis report

Static analysis result for SHA-256 9035064f2d11dafe…

MALICIOUS

PDF

83.6 KB Created: 2021-06-25 16:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb02c9b3d87157c99467edfdd654cbed SHA-1: 9fffa49d5288fe2d851200a2972f2f546517475f SHA-256: 9035064f2d11dafed3be9268e8b76a9783c5fd5b79e6ba176aa70591ed7ecd13
196 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress upload directories and disposable hosting sites, likely for phishing or scam purposes. The presence of advance-fee scam lures further supports its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://irlanc.ru/uplcv?utm_term=4+out+of+5
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608352c27b8e4---98832773554.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/bf73db0b0c113d948344cc4041a1a4c5/rurerejuluteveperaj.pdf
    • https://angkortaxiservice.com/userfiles/file/betekuzikakadolip.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16092c8ed871f5---labadovub.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/c1e39ee84d3d39a9601885d35e6bbcff/19243020503.pdf
    • http://wintec-samu.hu/uploads/files/nerenebegamubevu.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c8022b0f61495139a48ece9d67e19253/konorewu.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/a2c26829c624b83607baf9d6313192d3/fiput.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/da9e24462136398fb91d51042a42774d/75419050518.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c643ae5efbf---76829690279.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bec99cd994---22029405200.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/t6k2gpbcccfrk9gp59mlofjtav/90053026165.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/5a35c36d1143bef13d4ebc5d69097d0e/33825161142.pdf
    • http://learningkey.org/userfiles/bajovibawerisu.pdf
    • http://iphysiology.ru/upload/duweposasulirojulanipeja.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf60.bin
80a7060b5d87f0b6e331cd3abfb6ac4e892cdf9e418c228e7ec587d19b7cb22d
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF60 9620 bytes
font_01_sfnt_off0000e469.bin
bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE469 16252 bytes
font_02_sfnt_off0000fa49.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA49 16792 bytes
font_03_sfnt_off0001125b.bin
4015141be0214164ead76374cbbc822117f32e532f72dba1ff654215d9d4583f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1125B 17916 bytes