Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9028950326b23b7…

MALICIOUS

PDF

85.4 KB Created: 2021-07-14 05:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b16c7f4a30b36d7a61307b804c58d3b3 SHA-1: 407e5d4c0ec67d90563bbf354b593131b716d055 SHA-256: b9028950326b23b7c44256a3906ce768336a1c8e6779925cf7b0b9a054123446
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://queure.ru/uplcv?utm_term=rice+paper+wrapped+chicken PDF link annotation
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/8f96b850917d313916af4b0f632f99a3/98613891031.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd09b69b89---xoneliwidadogorekogowepa.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/74925723459.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/bobam.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9eeb0bb866---zobawusumaviroripet.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/pvi1hfb5reuk4kvl98q2f88g4u/84229410410.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf09ccb334---tirekimudesebar.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/u9h1j5fr4oohutmj4ti3grm4ge/narun.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/3d4h7n202n7qmm7gbfl36345m3/93471813455.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c08c1e9ddfd---vevusarepimivoxil.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210628014154_ksp66g.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5b8aaad14b---sewepaperusi.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/bibelovifunazo.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/35475601551.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/rakuruwogagivipijuverigo.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/46fe00e9f1c651402e70b700535407ed/fifejopugusokerexafuze.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/60962563520.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160cd25e75dd44---93858638418.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/78758674557.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/pepexeluju.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f50b0f1e0---bobagitaw.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/11967476780.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddfa5659d8---folivemebamosowodorot.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608eada068c48---notefa.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE924 10404 bytes
SHA-256: a11ead37fd2e5d28935b57515a73e22dab02c1cca636d177c33d5326cb2fbc77
font_01_sfnt_off000100a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BB 17564 bytes
SHA-256: fa6acf5871af280de97fa69309d17a6c0df7a6c55e2963c9bc47e2424784f6c1

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