Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab409a5cc88664f3…

MALICIOUS

PDF

76.0 KB Created: 2021-05-07 13:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e8d48047d1534cd9c10947772e2f874 SHA-1: e1a095c3d4f566ede1150d1e23cbd7f0374f4425 SHA-256: ab409a5cc88664f3f6c07aa5fe38806bcc62b14776d1c942e2f188ee3c901d40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous URLs, many pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to distribute malware. The document body, though heavily obfuscated, implies a lure related to employment attestations, a common tactic for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=attestation+pole+emploi+pdf+remplissable
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d34f3dbf1a---xufilo.pdf
    • http://automotiveenergy.cz/userfiles/file/34261066448.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887c5e2163d.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/d73b5564d80b76d1c81a49c2a917aa45/zasaboluligatudezeg.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/95335798646.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fa6e88363---27166127660.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/7f3fcb64b402d0384ddb1122966819b1/78813595799.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1b502098b---93774604314.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/29489165434.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160713e27b7623---levetixekewudenawop.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7d6e54be8---dajana.pdf
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/5692561667e0397d24ccf0aed04649e0/xabaruradikotodekujo.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/2bf4d4a4ae713b5a59a2d9cdf79edfd9/82229451318.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f58696a79---33430515758.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/4bgdp3ampf50utujphtu1og9h6/kemabukesaxafibofagu.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703c58b95b9---fesuzokeko.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/1b9578ad83619c8cf0bbbc72b338ce83/65188397115.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d068e20a38---libokagavatisef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddc7.bin
fda9ebbe8e6d3bfb92bb7909c248b910e87e54220a669d136f89e5bb1686f319
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC7 5104 bytes
font_01_sfnt_off0000eef4.bin
275fee40980648dd51858c9a1798de3a6411980abcee4aa06d5d6c51fc0020b8
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF4 11644 bytes
font_02_sfnt_off00011441.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x11441 4324 bytes