Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f3060247a896fe…

MALICIOUS

PDF

90.8 KB Created: 2021-09-08 04:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 65874b0d7aef0c1d3644d925608e15de SHA-1: ed3f7d0b15076aeb97cebba91d5c939337d6b1b5 SHA-256: b8f3060247a896fe941b7fc88db0dd1826f0854f780dccf04a6d23c469388a84
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous external URIs pointing to disposable hosting and compromised CMS upload storage. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://allytemp.ru/uplcv?utm_term=agricultural+waste+to+wealth+essay+pdf PDF link annotation
    • http://inspirationforexcellence.com/clients/66491/File/dosodurijerizekawem.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/natemolusinure.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fa4f444ef---xakuse.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/pukiwosogar.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/96577821616.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e18db7d9c83---zevegilerife.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/mavorokodakiwasolev.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/86959332719.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/978ad5ecb74c693c38a750f4c2fa6d52/56545010362.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/8595291044.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/jomudifofepi.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/1479938286.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/g0ajo5pcmnq0ksh27qlik9rvr0/63969768867.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/92787219307.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/ligonu.pdfIn PDF document text
    • https://samudra99.com/contents//files/36996521436.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/viwovenusepo.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16106cf90dd1a3---punedun.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9d7e50898---74163608297.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/xogosasujo.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/85768358264.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/91195394409.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_off0000fcad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAD 18440 bytes
SHA-256: fa9f3add5c463409f6c6a36e4d934746972d96cbac7d5bb1c7ea665389d12f35
font_01_sfnt_off00012bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14413 11076 bytes
SHA-256: c979aa5ebb3ce203e590f86e20788ae3d88235a9f90171c390d75c2301a30c50