Malicious PDF — malware analysis report

Static analysis result for SHA-256 495c86fab4274d1c…

MALICIOUS

PDF

89.2 KB Created: 2021-07-27 09:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 95871d1ee96a99507457457b1bcb385a SHA-1: f3c85f0744e535d6a0e73770c7f75e7910f28a1b SHA-256: 495c86fab4274d1c90679211c75d5ed28c23721ce6e14ceebc80f26ccca7e1da
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised WordPress uploads and disposable hosting. These links likely serve as a lure for phishing or to distribute further malware. The document body was unreadable, but the presence of multiple suspicious URLs strongly suggests a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16088f2de1ef8a---74222117499.pdf In PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/84169988504.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/7b8f0253db44c90f36dc532e83e01d10/45229464126.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec73d43966---87734726959.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95d584ed4---rebukusexevevovakegejapat.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608602c537230---japaropulebanutosax.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/59808807385.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/81185301017.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//79876604149.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/b1c0854beba0c9e7c79705884e8bacdd/65596094489.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/rawidowanoxego.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/80927681367.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d637bcae29f---71406672143.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/84604070812.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/34171989870.pdfIn PDF document text
    • https://klairtransport.com/uploads/files/13222121399.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b3c873e18---8086529478.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/6b15772ed08cd29f30ce076274a4fa5a/tiwipaluxerazelape.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2e6852478---xeponijagit.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/majedekaniposu.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/cb2940b1be9e63ffb7a9ca3491c5cdc5/tomazidodi.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609461ec6b03b---siranowifit.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/p6vtoa3s9jp2qahc1s67rnrsp2/96552910117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=picsart+old+version+hack+apk+downloadPDF 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_off0000f8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BE 16848 bytes
SHA-256: ac53c3ada9056b2acf23053af6bc868c93f0b22c79bb28ec92e803d42caea719
font_02_sfnt_off00013cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC1 10856 bytes
SHA-256: aa0392e932c2d1733a82cfb8245c52c643a956709d317363302e72a08415a781

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