Malicious PDF — malware analysis report

Static analysis result for SHA-256 375e7f996da7daaa…

MALICIOUS

PDF

91.8 KB Created: 2021-08-03 08:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9477ece73b53585d61515b71134ddd10 SHA-1: d9c29502684f66397bbfaebf8f97e234b94ce82c SHA-256: 375e7f996da7daaac20a1940d0f2d36a9fbca733996e5ba22746b7fa706d9358
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm on disposable hosting and links pointing to compromised WordPress sites suggests the primary goal is to redirect users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://vipforiraq.com/userfiles/files/nasopajuvamo.pdf In PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/e886867cf8b03877eb52468d6627696d/lapurepilogufiza.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/japoxupezeditena.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/ef3f7c70742749114624c07cd5fa3196/51619963708.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/b9d810bd3c3e9f8b6c156365831ecbe1/97150451257.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070964de1950---21081537281.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/ponesebaxobopob.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/bf5e69872ed8715e4cf3313f9792b0d7/17340340894.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/243420e96787c9fe60c1c9d1254a45d2/82342838297.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/51581883914.pdfIn PDF document text
    • http://shiksha24.com/userfiles/files/17251869085.pdfIn PDF document text
    • https://magerp.org/upload/files/24434876200.pdfIn PDF document text
    • http://allasclub.com/campannas/file/xukugidiremun.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/bfd197ed8f35ed312c79ab5c52a989e5/35906223172.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/2ldos9i0d0r0ejhlpb6p3tald7/delusufufudederig.pdfIn PDF document text
    • http://isvpro.com/custom/files/57436807337.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/livojixusipuvolutigu.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609f41068153a---duwonotixirun.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/v9ao71hg0dto5lf940urr7je5p/2858166664.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/f5890a6b5dca66a1db5495a296ca9100/30919030188.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/cc7a6d7e2b44dcbe95a797ff4873a416/74611149195.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/57710019350.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/podub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+boy+in+the+striped+pyjamas+full+movie+free+downloadPDF 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_off0000fe17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE17 18228 bytes
SHA-256: 2f53ad103060e00a478b75fa0536eff07b9be5f060928f0e3dd0cf9b2efe347d
font_01_sfnt_off00012d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D94 11360 bytes
SHA-256: 68cc58c01e2f3dac5aee820df1921ef7bc4716973ce2ab31000bf3538d1d7a1e
font_02_sfnt_off000147f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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