Malicious PDF — malware analysis report

Static analysis result for SHA-256 cecb1c6451fa856f…

MALICIOUS

PDF

81.0 KB Created: 2021-07-31 07:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 34d7d19543853cba5698ea1e4c1f2bd2 SHA-1: e5938c35811ecded7283dc41f51d324a091e79c5 SHA-256: cecb1c6451fa856f5febfc48c4a59a1814bc45a5392dc5b233f5de5c06bb0de9
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and embedded URLs are indicative of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef6e31b333---56094366979.pdf In PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/fej7vrm8uit1876llilshn4l88/mepimav.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/lutezeku.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/76ritb214dcn7c3ianceldgqf5/bawokisudegalinuripajobot.pdfIn PDF document text
    • http://acunambalaj.com/adenoto/upload/files/jupoxeduwugajofagatumigog.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/nhn2hfjsvlu558ldqjag88pd0d/97225852027.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/0c56b9a16e742d592117fd34027be5a3/98346383121.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/momixiwanetalim.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/jonafakilaku.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/77aa9329321b6a2a409871648b22a530/nolokug.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/35885455238.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/99524949636.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/tamiposaxewesitijam.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/9153bd807bb5c91ff7b0d4962ee841e6/89434620034.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a54c24bf9---zetiro.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/ludobofi.pdfIn PDF document text
    • http://llux.vn/uploads/files/timarepa.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160885406d158a---12711667136.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/24339664508.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/voligegajujisabolegid.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c146a37db82---10633969702.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/94a695e691f1bf4b01366a2bdb29b035/51668351476.pdfIn PDF document text
    • http://rinsacars.com/files/others/kopej.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/26449127875.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/06ad049d108adddc07589bdc0c556b96/jijolegofuxerikoruvemuw.pdfIn PDF document text
    • http://uctodane.cz/UserFiles/File/66748869062.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=3406b+cat+engine+service+manualPDF 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_off0000d90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF120 16768 bytes
SHA-256: 767ef1db5c6f63ceafad722f4b495d92a62dc2cc37c5d023559b45a7b5224d9d
font_02_sfnt_off00011bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB8 11204 bytes
SHA-256: 57f4e0851cc2a3d7933e3ff3163518d853529088ff951c58f40819b22080296d