Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fae8df1cd5f92ff…

MALICIOUS

PDF

91.4 KB Created: 2021-08-16 21:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 9430325d3570df7cf596d844d93a98e6 SHA-1: 9d7e5bd406b0e3d570204aa916710f955399187e SHA-256: 4fae8df1cd5f92ff730a0e61f6380dd3a2303328521d97b6d4c7fc7179b3a454
204 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a LOLBin command-execution lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://namuvaldymas.lt/userfiles/file/ponopexukisin.pdf In PDF document text
    • http://fittbikese.hu/files/file/2425397871.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/34408539776.pdfIn PDF document text
    • http://barksdalereunions.com/clients/869108/File/79791828001.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/19965f6424c897cd60469f4985158e0a/vazugibuwavugedeve.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/97646625980.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/furiresasepajom.pdfIn PDF document text
    • https://securitydm.com/slicice/file/1201517834.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/vubijakifapu.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/63dd78b7050610b9c513a07123e576ec/vomalulubedokop.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/dokovinemujokilat.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b57a701a80---50215459681.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/34423952923.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/omptckghb1ammf3gm1uhscmk62/dewatijevokoxeber.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa5cd5fa14---rotibifagujojized.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/futobuxomijafiwofi.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795d9eb3285---77506452596.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/lutidupunid.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b4fd57549---80125685005.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070611dec501---xogawakovenedok.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/vosuwuluj.pdfIn PDF document text
    • http://exosushi.com/uploads/files/53320183678.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/e642dee39a8ec14f5decb11346360657/37928954084.pdfIn PDF document text
    • http://industrialdevices.in/uploads/gomijobapew.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/jepepikuwupemorikurisaj.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c21df5f08e9---tawoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=hotstar+app+free+download+for+pc+windows+8PDF 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_off0000fac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC3 10900 bytes
SHA-256: c2687a68b04d8e6fc8f17cb055fa105c02d5c644e80849c76b0fdc24c91259aa
font_01_sfnt_off00011421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11421 18476 bytes
SHA-256: d30679db03a578afc6eeb1890e56e31e3f76b22896d40200c575119080ddc57a
font_02_sfnt_off000144f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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