Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fdb5ecd4e5a0097…

MALICIOUS

PDF

83.3 KB Created: 2021-09-08 05:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6b5b4237b17242f7b60415a73c7fbda9 SHA-1: 45f90034a322ab316a209d3a4661c43701c4a7ae SHA-256: 9fdb5ecd4e5a0097efcd24eb8dd1b678c5d4acac21a3322fa75f913ebdb33d90
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is classified as malicious and contains multiple heuristics indicating it is a link farm and a callback phishing lure. The document likely attempts to trick users into calling a provided phone number under the guise of a billing or support issue. The embedded URLs and the nature of the heuristics suggest the document is designed to facilitate phishing or scam operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://smidgel.ru/uplcv?utm_term=2004+chevy+trailblazer+ls+owners+manual PDF link annotation
    • https://djennebeads.com/nbloom/fckuploads/file/21014309616.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/siretuxiwomiviloza.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16100e9ef7e08d---kotesipatukuzi.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb666c6af2---69036011602.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085f4b995dff---21657504029.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/93263248556.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/69672303669.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/69247086557.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/zituwonotazoravuzo.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/0522a10e5d8ffeb24185df9d98352c1f/5000887330.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/f03ed42a2e6b7371fb0641c8a8886415/jinevejaxofepad.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/a07bef6a62d858b2b6d8a576d176ccc7/58676626667.pdfIn PDF document text
    • http://proxima-design.cz/files/file/fixekukegemunexusaviwiso.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210620131607_1107613533.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/54923288928.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/wovexib.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/2bcee563b0fc1a57fa939c104befa647/garivo.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/gulavagoninipinizipawad.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c6613482319e2fb15d56434c7e061842/lunababalexujizod.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160810170cdf46---2155750753.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/ruzezazafefu.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118be5762ff6---54295363345.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/60222899730.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088193a4887d---zimabiwejenowolifa.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/sevozisakigevexa.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/tomituzopimubowinateg.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_off0000ddc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC2 11284 bytes
SHA-256: 46319e7badbacec09147da3c9f651c53a69bb34070c8c3d1bbe5acc4a0ef7400
font_01_sfnt_off0000f839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF839 18144 bytes
SHA-256: 80cd58f333c28072002df64683a91cc06368237d421e1b5f1d26822882704c61
font_02_sfnt_off0001277e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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