Malicious PDF — malware analysis report

Static analysis result for SHA-256 7024b2887350d6f2…

MALICIOUS

PDF

87.4 KB Created: 2021-07-30 22:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 54b995a96ba62b37d18ca95a3018ec3b SHA-1: a183ee78256f306e4fa7560f83b927d83054e862 SHA-256: 7024b2887350d6f296b93b1cb0ca9d2881df12c5b5353bc2309adc50249ca34d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. ClamAV and ML classifiers strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://fundacionecla.org/resources/original/file/lebugesosoxiv.pdf In PDF document text
    • http://sys-svinding.dk/userfiles/file/dajuvoluxede.pdfIn PDF document text
    • http://janandpoos.com/clients/872640/File/tanerajemoromup.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/jajiraxipejegerirafodirel.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/d35a262396d1f990c48806c910c9e65d/42316227597.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ac19af554---69157152729.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/874021b3905ec4855c5e3065a85dcfc5/48189763846.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/c1da41aacac0874428f3ff4795ed6b5a/81275832303.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/cef12b40dad6352b6faece445d4c964b/senafunatobugefulepu.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077a4b9aab25---84870645298.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/18312267700.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/g1gpaltfvjv74r5nl8lpuvjud8/83069547411.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/16309680682.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/8852811447.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/815ddced1e8b3e18b8518a2edc67ad53/relilupabi.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/dnkalfudph0pachhsg95sph55r/20540153193.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/6ed77288413081273cadb38412e9b755/vosulekexita.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021430141571533.pdfIn PDF document text
    • https://avvocatoboretti.it/file/lebanitepesagafifojugav.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/34868711353.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/s7rq0l6hg52b7d6njvh795mm30/55859760714.pdfIn PDF document text
    • http://samsung-service-center.ru/uploads/files/raximoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+invert+colors+on+a+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_off0000f077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF077 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10889 17324 bytes
SHA-256: 8cd55bba38c1115e2cdc8463f44a933ca2993bfe80a011662f182c68b8a0330e
font_02_sfnt_off00013620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13620 10756 bytes
SHA-256: 887ffa0cf645e89894987912076f20c187f078c5a3356c5d75a073caf33a68a4

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