Malicious PDF — malware analysis report

Static analysis result for SHA-256 f66f4d5054f02b1b…

MALICIOUS

PDF

79.6 KB Created: 2021-09-05 01:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: da75765c6e9d6e8be4dee2552081fe6f SHA-1: adefd001d34c851295bbbbada76d6bb9a374811e SHA-256: f66f4d5054f02b1b18e904bfc0c8ad7f5e2e3c1ef10ce4c1e1de0117caebfeef
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to domains identified as potentially compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://kondicionery-ivanteevka.ru/upload_picture/file/34047250562.pdf
    • http://bptramptour.pl/files/file/xivep.pdf
    • http://cw-cut.com/uploads/file/79918437076.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f7f566435e5---somepapurugasirus.pdf
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e1dbba282---56972705285.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080167e8c1c5---wovewibadafujo.pdf
    • https://ringid.vn/ckfinder/userfiles/files/93565811433.pdf
    • https://uclerbaklava.com/resources/file/23815006310.pdf
    • http://sparkpro.lv/content/file/48213319318.pdf
    • http://sun-eko.eu/files/file/97439705559.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/77bf965437c1b696dcae191ea34740c1/90380824463.pdf
    • http://zhfangyuan.com/uploadfiles/files/makozavokugotatunevedime.pdf
    • https://livres-d-art.com/ckfinder/userfiles/files/60293054676.pdf
    • http://epoetryworld.com/clients/53741/File/66012147074.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/700f457147b87aadcfaa7b1012dac602/65586632737.pdf
    • https://soudurelausiere.ca/upload/editor/file/widisunaguwizi.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/0a7311f705ccdd8f15e86bb9d9142ab2/fevudebidagisulufujo.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2d675e021---dosagigufativojidobuzatul.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/83346ae933918843a7a1f93a9d9a551d/90600416711.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/49f46e7031ade5398437bdad4de64b77/66782116946.pdf
    • http://boxerdapolenta.com/cmsimple/images/file/wenivoxetakidomalekumifu.pdf
    • http://medianet2000.net/amm_prod/image_news_popup/file/lowenebujolemonodike.pdf
    • http://npi-management.com/ressource/site-image/files/jobirixabevifipewuwejepu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=discours+direct+et+indirect+libre+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_off0000d164.bin
c1221cc90c705aa723234954429fcd281ddfc84cb05eff2200550490668c4482
pdf-font-stream PDF embedded font (sfnt) at offset 0xD164 18148 bytes
font_01_sfnt_off00010082.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10082 16792 bytes
font_02_sfnt_off00011899.bin
7eec482d02248ac135abeb0d44a14d37d6a88b30b3347c5b2b766ae38ca0c2e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11899 10692 bytes