Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7fcbb62c1bf0afb…

MALICIOUS

PDF

97.1 KB Created: 2021-07-03 03:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 41969971c644081049bc781f0807be90 SHA-1: 44e67d82742664ca8a03fd5547eaa3d27541c43a SHA-256: c7fcbb62c1bf0afbdd6618028e3bab2398eebab4592d6759dbce80b2d73413fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress installations or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with PDF-based exploitation or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://zjhywt.com/images/upload/File/31635539186.pdf In PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/4c678098dc7ec1403fd4542cbb31005e/dazam.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc3f6e39a0e---54566506236.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/vulovibovanutuzaga.pdfIn PDF document text
    • https://superpart.com/files/64181253577.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/30345465650.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/subuj.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/cf693146c2ba7b3cd441acd5d720d7b0/2190403010.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/64798963477.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/9b9djcbn8rj7uh5mv1fiso75e6/47151696641.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/42387539715.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/54506028795.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/mjkendejbh8beigccvikhr5opc/18250172203.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/legodivujupuwa.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c837afc90---zemebufiwigojijelix.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/39749829859.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/2213e056108a9ce10807d8b800ac8de2/26922015101.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/fc29558e8f535087c99e3333926eb763/5949584671.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/0ffd8dc275f333e3fc8ef9afd9c39e59/gijovoxanokizinono.pdfIn PDF document text
    • http://vejwun.cz/images/61357444336.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/djlvdju7aokqdfrs3okfj41i80/rivafurenebilu.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/7294c1d68f283fdf12e54436045d3bb1/17497784242.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=squat+toe+touchPDF 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_off00011ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD3 10136 bytes
SHA-256: 6a4deffc02730d517f31b1a727f54a70e4eacae2e7915258a3e3329d8c901485
font_01_sfnt_off000131a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A4 17704 bytes
SHA-256: 79642ed249575b777d5e645b7fefd4e7eddb4a317a9008f1298800c394e69116
font_02_sfnt_off00015f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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