Malicious PDF — malware analysis report

Static analysis result for SHA-256 5afb155f20f406b8…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 22:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 888e12fa2449df0f73348679fa86a2c4 SHA-1: 950ad80d4cfff9f4785d0207b32b37009ac32ceb SHA-256: 5afb155f20f406b8d4dcb2466b43055958a328869fb2ad21bdb86a45f92aa3e8
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The primary purpose seems to be directing users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://tjpapigroup3.com/contents//files/73968160817.pdf In PDF document text
    • http://aedelsur.com/contenido/files/37649582873.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/feruwetuvagarujugeruk.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097694947e2f---34585153646.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/749d6cebccd0ceff77d0936e7b5d2cab/gedakiwavuburanu.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/tidikomegugukiko.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/b6ead6a8501ab918510984164bfb2a76/namerurix.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16097657a91d21---gasapexigoveku.pdfIn PDF document text
    • http://woodwaysindia.com/uploads/81773523125.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/ade6a3c11dfdb74c371dec22de7fce5d/tikegojumufiw.pdfIn PDF document text
    • http://allasclub.com/campannas/file/lewefodapitojobuw.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/594f806f6a15cdeb672d9027187b59d2/wobosulelefenozupagub.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612abfccaf9a2---90711366309.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/4c8d556a19ce399eb0f8ec2024bf9592/sawitanevumaketu.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/17f9455e141882fa1c884713cdc97414/45637744768.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/2959889746.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/0a3e0dca44b27dc3ab2c773aded3a0e4/jomavaxusefokoruxuvufula.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/kafexopu.pdfIn PDF document text
    • http://tipiland.net/upload/file/rufogekolasetelutuxomugo.pdfIn PDF document text
    • https://motecx.com/images/file/49747216267.pdfIn PDF document text
    • https://hssanesteban.cl/files/30364415451.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/43989417228.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=the+burden+of+proof+book+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF232 18276 bytes
SHA-256: a1f8c3138dc39eab31433e93872d871ab1608fd5642ab1df4340f71b53a99152
font_02_sfnt_off00012238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12238 10324 bytes
SHA-256: 9361bccb0a3df35f4326912662c300464b16d789506c24a387cf032c5e41a778

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