Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c9482b8e415f26…

MALICIOUS

PDF

78.9 KB Created: 2021-09-05 21:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3158822d7e5bb50c9d6cb7643be43519 SHA-1: 7c207f634ce3419c5872b86bdbc7fe1b18f77196 SHA-256: a3c9482b8e415f26d4d205df86a1253ff3960a9ff854bbcbd41552defd5e9049
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution lure. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075849c064cb---57258542500.pdf In PDF document text
    • https://elminhaj.org/userfiles/file/28006249269.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/99950049606.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/820710076024de361537f90df57a8ff0/vudowuver.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/nixabik.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/nuditefiwilatojalip.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/84666557633.pdfIn PDF document text
    • http://axwelindia.com/uploads/zosowekoxesabupebogu.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/2near4gl7jjjht85u5lgcc2in7/tadafegikipinuterari.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/tuwalebuvadi.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee2d3daa9ec---sujewozomobe.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/58284648488.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d4b79284717---84087750101.pdfIn PDF document text
    • http://workontext.ru/media/file/gogozikixavexepam.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/d88c05642204cafa9f527105d2c57a64/27576158129.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/peturoli.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/1547100602.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/cfcsa531qfp56labm7v4ndvb9o/74589998940.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b7848d810---43597708199.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/12565913628.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/47266993036.pdfIn PDF document text
    • https://360mart.net/uploads/files/mazisajepasipuloz.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/vasasise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=combiner+plusieurs+fichiers+pdf+ensemblePDF 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_off0000ce6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6E 17780 bytes
SHA-256: ae481a7345208822b05c4c5dbc12d38a2ad23074fe03935dcd51dabd5133ba88
font_01_sfnt_off0000fd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11587 10896 bytes
SHA-256: 43a92787087c7e414e0ae9b125d9e4d6ca12cd2a724096090d1b3bcc16ea7ee8