Malicious PDF — malware analysis report

Static analysis result for SHA-256 21929db6025e70ae…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 16:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8b870f7fa2cb6c2e666fb189b878173a SHA-1: 19d7404f3537a7965d5e63123cb85de51b98e3c9 SHA-256: 21929db6025e70aef7fe5d40810c09236e9187460dc8f9c67299f4475dd94286
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

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://playitdirect.ca/ckfinder/uploadfiles/files/98075739951.pdf In PDF document text
    • http://usarsenal.it/userfiles/files/85031534755.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/3256098029.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/52918541518.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/palibeputufebema.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/26331754983.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/39377165371.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/3646432417.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/lizezavixoxatabezi.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/moperitesobedifuveja.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/a75a93f15f75bbe052507907bd2caa03/90561248356.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613081809ff2b---nofalixerelozixofigo.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/61529498909.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/dejifabarosa.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/cbffd7e0f65fec597c4d1fbe8bef8680/botelo.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/dijabesonapizasulal.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/41886516347.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/tiseregedubujiguxokuf.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161420e95acb7c---lezojaxipelijupowev.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/vibebibuzizoze.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/4220883816.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/bazixelireder.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/4454820652.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/giratamijujedulowofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=area+51+iptv+channel+listPDF 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_off0000e25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25E 17724 bytes
SHA-256: 32ad751b3e4efeb0c04b812591c01b0d39bc363be16f0508d21335aa92b15790
font_01_sfnt_off00011040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11040 10584 bytes
SHA-256: 274f9cb9a397548b7b805a309bf9ef73e106a268ff9893871802fba1abc00096
font_02_sfnt_off0001287c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1