Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d91e656741a792f…

MALICIOUS

PDF

83.4 KB Created: 2021-07-31 05:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 37c2331cb5279fac3fbdf139fbc9ac44 SHA-1: 80f7dce3362cdb964452b66c27ea8fd3f4a59e9e SHA-256: 1d91e656741a792ff0a94fd707076f86e16cecac1498005aa1afa9248e7bfe4b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards the document acting as a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://drafthe.ru/uplcv?utm_term=essentials+of+pharmacology+for+health+professions+7th+edition PDF link annotation
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/79669c465caebb31ea0c1533daae584a/nikevuvaxasobigomupinat.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/24098494871.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/firolugosopenepusovi.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e8337ed02e7---72493141687.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844c152b273---27946488084.pdfIn PDF document text
    • http://foodchemsino.com/d/files/woxuxumaravato.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/32b425d47a63323690f76c9d57e371e1/64828200911.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/afe063dd62b08dbe81173355a0bab5b4/xaburovodibebojip.pdfIn PDF document text
    • http://minhanh.com/files/13878934571.pdfIn PDF document text
    • http://drtamerturan.com/file/20237247047.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/ea3fa30453a286a824b48bc958de6df1/12471031036.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/mekiwuw.pdfIn PDF document text
    • https://securitydm.com/slicice/file/womakulupesomexolemar.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cddb23507c5---70653018522.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210612082127_94ihph.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/54318957278.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/29910062011.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/udhr95cdm10mncgo8nu25g30d7/18626792042.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/denudibuxuwalutulodezoze.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b770d4e98a---56371214727.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6808ed9310---dapovo.pdfIn PDF document text
    • http://charivne.info/images/file/togalebugamumiwu.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/64921237518.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/kukedopirodimuzikiro.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE013 11212 bytes
SHA-256: e744121adedbce0319c2df1c0adec74fbf106a7e98220c9fec8eccefc904fecb
font_01_sfnt_off0000fa08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001121a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121A 17092 bytes
SHA-256: c463a5e5b3d8c4dab18d5acbc0f0c7892d18d901eca956e42beba78dedae5a2e

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