Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf44cf63ca07475c…

MALICIOUS

PDF

90.9 KB Created: 2021-07-30 16:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a1b7aa22ce0d71362d876e891817a02d SHA-1: 4f8cf949747dc75a6ed5fb99bf9f4b3794cb01bb SHA-256: bf44cf63ca07475cc26073fd7bfd17fcb108f72028bf286c5367b47a21930375
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document body is heavily obfuscated, but the presence of numerous links to compromised WordPress upload storage and disposable hosting, combined with a 'Callback phishing phone lure' heuristic, strongly suggests a phishing or scam attempt. The document likely aims to trick the user into calling a fraudulent support number, potentially leading to credential theft or financial loss.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://dobrasekacka.cz/userfiles/file/fajilazezarupuxedetap.pdf In PDF document text
    • https://renault-service.com/userfiles/tukikifojamosilixibugar.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fcc2508e0---57645743695.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/28003739067.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/mulajuf.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/sebiwutonuwevuzi.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/b2h3rf41cm2kvka8b1eaojdmo1/40199066765.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9353b6988---pabamenotamobewetolexa.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6323d8f25---navawuniparidudutupot.pdfIn PDF document text
    • https://rcot.org/userfiles/file/68141602042.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b623a0e97---69763659636.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae29619a01---6548174544.pdfIn PDF document text
    • https://efnnma.org/files/file/18932425.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/57470548430.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0416a3bacb---dewobad.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d0e0d5ed6---gigezaxa.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/c4s9qstqm28uaequvil74jeote/31260884447.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16083db53934dd---bolutesukevugoto.pdfIn PDF document text
    • http://simonide.org/userfiles/file/50843830012.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/dakenizi.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/26579420406.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/21828977510.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/9966851a5bd3e5220848dcb5e994a49e/32609795554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+pair+sony+soundbar+with+subwooferPDF 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_off0000fad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD5 10980 bytes
SHA-256: 94dfaeb6d0d2db2557df135a7727be1def7314dee71f12380b99d2534aa5d803
font_01_sfnt_off00011416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11416 18356 bytes
SHA-256: 7efe27374075a2b09457e9f02bdbe35b6ae71d5a8a818c69cd1b84d8eda45909
font_02_sfnt_off000144e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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