Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfcfcc8267abf223…

MALICIOUS

PDF

82.6 KB Created: 2021-08-03 01:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c3dc893d01024dfecc8acf9cd162c6d SHA-1: 6111973b5b77279365d0f2d51cfba35a42790b90 SHA-256: bfcfcc8267abf22311c9f3a90908db1009354db6c62b79297fb94e958206d5f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://oniceh.ru/uplcv?utm_term=quadratic+word+problems+worksheet+algebra+2
    • https://faresaldabbous.com/uploads/files/susuluwevivewi.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd47679c582---lawufezupanokejive.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/7626e5bb9eaa146f1d9d2c9d377f7adc/wefinubogatemaduwowipo.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d33666137---puwog.pdf
    • http://exoticland.bg/upload/files/files/kotadevorubapexini.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160dc84569f4b3---18822808939.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607057cc8813e---giluzotoz.pdf
    • https://lesura.net/userfiles/file/25859824778.pdf
    • http://bebelino.ru/userfiles/file/fowapasirewuzumonut.pdf
    • http://usarsenal.it/userfiles/files/32348141617.pdf
    • http://18554080.com/userfiles/file/80049675515.pdf
    • http://worldprint.su/userfiles/file/93881078336.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/d5ec1c077957ee16b5c01b48005fe935/33912241209.pdf
    • http://fvv-hohenfelde.de/sites/default/files/files/liwelixudetezo.pdf
    • http://radtel-sport.pl/userfiles/file/medoke.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608a04eba837a---wijarajaxodenitax.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/f95f4a3f7906cd8ca657aca3cf72a211/12672056756.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e9ffaa61e---83817130758.pdf
    • https://wecareprogram.org/images/file/kemofopage.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/ct0jabm8ms0dihrh1curvvt242/34981383368.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d056c97adee---vujipenuporedalirunobiz.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c88a430019d---daditememez.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072979eccb50---dimifosubujevuniroferixa.pdf
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/fapovapujodutixek.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/6d7a7682303cff55f8930f44f0825e4a/59017613357.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_off0000de84.bin
d8c0946f0baf2e7d3f9602c0b1a8d6d5babe8d143f3b92b1208d60345dab1909
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE84 16140 bytes
font_01_sfnt_off0001082d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1082D 16792 bytes
font_02_sfnt_off00012044.bin
6d267b27308acbb6cb3174cce0f93ff221a267001c6c3f1ab15dac837522c8f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12044 11456 bytes