Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b248301c3681e5d…

MALICIOUS

PDF

84.0 KB Created: 2021-09-07 14:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 88a9683fb0328c9e4996ade09a7906f9 SHA-1: d01af9586296b7d52940a2d6ec3be05516ff64b4 SHA-256: 3b248301c3681e5ddd768fa02e91e93fcbbc33a05859489d610084b3fd208caa
156 Risk Score

Malware Insights

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

The file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to external resources. Several of these URLs are hosted on compromised CMS uploads or disposable domains, indicating a likely intent to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://arvikabc.com/images/uploadedimages/file/wawaresugaxavu.pdf In PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/kefizolikafulugikubopolus.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/26370673714.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090614251373499.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/vumorugi.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/fegadivapemipudexelutepo.pdfIn PDF document text
    • http://rilta.net/userfiles/files/70051578030.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/46496756829.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/1ec0e8bb05035d256e9f51b73384a604/nukevumodemosa.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090290ddd1fa---gugetugolalifu.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/21203463936.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/f874qr1mt3991n4ekrc1pqpl29/xanubuvuwem.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/59862449042.pdfIn PDF document text
    • https://ccichn.vn/data/upload/file/77216577006.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/viguk.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/94421334559.pdfIn PDF document text
    • http://thaide.org/userfiles/file/60945260541.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/tokitupusifonusew.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/15830031123.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160759ec779ae1---koronajivetevuk.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/5adbe56b3c882b45f16145065ccc9dc0/polifil.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/vlqbiu8q1na5ka8f73i2lnksd1/17517962311.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/sinopika.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/misejekokipojigexop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=barriers+to+effective+classroom+communication+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_off0000e296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE296 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA8 17532 bytes
SHA-256: 84b9591c375980025de64fba12a203bd155e83c2abbd280271e958b86453214a
font_02_sfnt_off00012864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12864 11000 bytes
SHA-256: 983844d365eae33b43f88fc8311d82528b7177cf7032674ccaaa3ab3dc63667c