Malicious PDF — malware analysis report

Static analysis result for SHA-256 f33ac97b8d80cb35…

MALICIOUS

PDF

84.7 KB Created: 2021-10-07 22:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d3bc4f7f0dcb59d1b4a94de2f59f2780 SHA-1: 46193a6469251266d725b5e7187b18ae398c7c72 SHA-256: f33ac97b8d80cb35cd89bada5606ac1d64b119d3a15661f5966d571575dda8b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded links are indicative of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://casadiriposomarsala.it/userfiles/files/danana.pdf In PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1615102d569555---67461384230.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/54239591988.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1615888024fd57---xusesapasabifud.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/52731948822.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/basoxakalasadigiful.pdfIn PDF document text
    • https://tsolisp.com/files/file/2807928240.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/dozopegamegukixazifegekiz.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/vibunaburexivemas.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021092112184680554.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/74292246388.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/7f07f3104e5f5d425952a08519763d13/72682936271.pdfIn PDF document text
    • https://karjerastests.bankai.lv/ckfinder/userfiles/files/zaribagi.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140d82f2fab4---dadoluwojebamatafiliruxer.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210910_70E6F7664AAC2E2D.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/89914448875.pdfIn PDF document text
    • https://full-e.com/app/webroot/userfiles/files/20211004_121551.pdfIn PDF document text
    • https://exclusivelimoservice.com/ckfinder/userfiles/files/71840058702.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/dapoxag.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1615c2ed6068e7---rixogu.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/18951860800.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16159625ac119a---21443877468.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/nuxujeraf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=non+pharmacological+treatment+of+asthma+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_off0000e67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67F 11044 bytes
SHA-256: c842a278f15da67d8b8636a1f9b00b2eeaecfbb502262aaf40cafa75b71d38b8
font_01_sfnt_off0000ffd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E4 17616 bytes
SHA-256: 23875b7f8f5f375c1e9150a244580c1907b0ea103be1167175f47379138a672a

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