Malicious PDF — malware analysis report

Static analysis result for SHA-256 740e6096a7bbf230…

MALICIOUS

PDF

86.5 KB Created: 2021-09-12 10:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0785fb784aff2ef97ccf52a7a3471cf2 SHA-1: 36b83c2660a677237868eb75ad930079330112fd SHA-256: 740e6096a7bbf2306c6818041ff7e92ab16fd9c080ab1a6b89fe8725e11e80af
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://jcbcharpentebois.com/ressource/site-image/files/60503899703.pdf In PDF document text
    • http://interreg-ipa-husrb.com/downloads/pavow.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/48684004169.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309627935f2---gedanokuvemolexu.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210903180525.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/maxamuvijusavuletizo.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/ralugadirojipapokebimema.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/28667958941.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/95805590278.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/jizej.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/gewapopinoxuj.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/37001721072.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///ranifunetizawutakukiruv.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138923201571---zonebe.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5b1eeecfd---97570061303.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/tenusodusufolepup.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/nevul.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/reruvigoloxasiwujuleba.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/2619340811.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/mijixomifukilunusavidowa.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a738fc7760---bimuliguvoguteki.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/kerewogagobotulaxegub.pdfIn PDF document text
    • http://hujiangsy.com/upload/files/wenebotiranegujolewozas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=old+minecraft+pe+apkPDF 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_off0000ea36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA36 10612 bytes
SHA-256: 5ed68252ea2c1f9727cb143b02b32199a903ece1e4443fa614907a56f53aea4f
font_01_sfnt_off00010262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10262 19248 bytes
SHA-256: e0fa9705c4df0b9dd2094f38301695c5b492484ec665217a5a111d6cf3451256
font_02_sfnt_off0001344e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1344E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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