Malicious PDF — malware analysis report

Static analysis result for SHA-256 a56d7b8fa98b3181…

MALICIOUS

PDF

95.3 KB Created: 2021-06-28 15:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d517f0d792036ba7b06a5a1f1ff41a5c SHA-1: 138ff79a28f80a84729e4a7a71455c4d1f7f412c SHA-256: a56d7b8fa98b318139a24ba5d223d5e4144ab0717b5cc6417aa8729ea823c35a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the presence of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/c34b1efd8698f75593b393988be18782/gafejolotupedi.pdf In PDF document text
    • https://hmanagement.net/userfiles/file/95682647237.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/64374427798.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/58186431782.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077558a5110f---70039600627.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/7a066f670d1b441d899f55846cb2ed2b/japudum.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/98277734415fad30f8f1ab6015534636/96035310138.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608107f32264a---wasudigufoxuzit.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/wepatizitisadozawutitopis.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/79211818477.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098456a85616---41930281800.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/gawufazewizeterijemiso.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607bde272948f---49726665144.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/20099498499.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/k96h38nrto087k1ltlects6ojh/pifipiniba.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b474dba5deb---majugikepawidige.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/64762572499.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/36983b2372db3514f9e0bc5ddbf49b69/mogunewir.pdfIn PDF document text
    • http://fletcherfamilyreunion.org/clients/52745/File/pexigot.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/64311917c61d60c8a1805b36e3e18f8b/94479766244.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dvarl2q177plj2nbmrrplk8nal/36934972953.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/65fbf5534382c02ee90d0f5da7bb2cd6/82124343046.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608397f7db59d---velaboxapeguzagesenasivig.pdfIn PDF document text
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/24486280.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ch0m4jsjonact2dkq238r06kn8/goluko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=pogil+enzymes+and+cellular+regulation+answer+keyPDF 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_off00010dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFF 17896 bytes
SHA-256: 3f614454aed5462a46464de463ad9565ee86b3b070da12f982350be70a3ffb6e
font_01_sfnt_off00013d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D5F 11164 bytes
SHA-256: 99d6b24a73c7df06c535f0de05d7de7596b581eafe8d29bd51562142402d9b08
font_02_sfnt_off00015768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15768 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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