Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2428bae8add6f58…

MALICIOUS

PDF

76.2 KB Created: 2021-09-06 21:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 02da4d8d49e91bb46919968e5e949424 SHA-1: 25d52390a5a29b2d5902d3c5158d0f42276a50b9 SHA-256: b2428bae8add6f58ed0d4104d26ec9f1b4232bbc8baec48a1ac30be42924435a
216 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://archism.ru/uplcv?utm_term=pdf+to+word+free+download+pc PDF link annotation
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/536b0fcd752c137b2fd5c0e56fe93645/87830842719.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/lelixosiwubebup.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/xajij.pdfIn PDF document text
    • http://salwex.hu/file/fugonibedisekevajobo.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be1cd7117e---zegazujovasumawozixa.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/ronibudamorurisexam.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/ej6osi8r1q2a9m7sqo8rdtev1a/69261723224.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb6e2f065f---39453600792.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f3be7f2bf---xodavok.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8af8f66ca9---sulud.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/31005337901.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/n26c6pishckum9iidok3ij30s3/gipuluduwuzut.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/zapesogetugofuvematujevu.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/sokerugijarevegozuliki.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/20ihif0r2dhd1cd3a9jbstc685/vuranotodog.pdfIn PDF document text
    • http://ipublicity.cz/data/file/97521772951.pdfIn PDF document text
    • http://mesahighclassof64.com/clients/874441/File/zopudof.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/mawonito.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/3f0291c176d7a3ac28bd0c95c015d6e9/20243010168.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/mokobogamonom.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202107232142335154.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_off0000c5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B1 17652 bytes
SHA-256: 9495e579402257267466e33cd93f5e3d9ed558d67da49305cf6f17a0e15c6dcf
font_01_sfnt_off0000f3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B3 10440 bytes
SHA-256: f49ca6a5ee80c979d5970de7c80aaceaa9aa8342718e5bab13db513d1e402160
font_02_sfnt_off00010b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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