Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6cf45f0b09d9912…

MALICIOUS

PDF

87.6 KB Created: 2021-07-31 10:41:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a3ba5c30b46769769b9e9b813ccc529e SHA-1: 74961a25357ccbdc55cd4772649c7f9357e0dfae SHA-256: e6cf45f0b09d9912ea0b087103a41561479fe20d9b88a19b220fb869ec3df377
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to exploiting vulnerabilities within the PDF reader or tricking the user into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://crewmak.ru/uplcv?utm_term=12+week+periodized+training+program+for+beginners PDF link annotation
    • http://big-blue-bus.com/pics/fotos/1/file/22774517536.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/jokodilepojinuponanupevu.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/i5pgmboa7v41cs85namcg7mm30/51469995483.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/pasut.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077cf09b3942---665441878.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/9a297360bfe572b4f0ab4b7f115ad4ba/jolegelefuboluxaxutufuraf.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/lowozofo.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/19347500399.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/09fdd9a352e48b659c695645f13eec18/74219340480.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/15955422216.pdfIn PDF document text
    • http://effektfilm.de/files/file/82377690760.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/l6ph7accmn2s6gfkt00l27qaq1/gofenafe.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16095cd804db42---51993106243.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/a69868841dd71493dd5613fb3f76fb82/madorakazexulupupuxolib.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f39817f2070---68802988506.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/givotupixa.pdfIn PDF document text
    • http://geoman.cz/data/file/nejomuril.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/k64oknrkr3dlptfep42at4nqf3/6787709118.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-2/20210502051642181707.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/bukiwipivilezanipi.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b30a69d91f---jepapow.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608490fcd65e1---95766202290.pdfIn PDF document text
    • http://centrons.com/uploaded/file/210444823560b03c9698658.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_off0000f01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10831 17428 bytes
SHA-256: 26c9002e42db25b63201036d25a0e5ab3d5010cb8e0f7a386fd54c52c147a26f
font_02_sfnt_off00013566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13566 11248 bytes
SHA-256: 9e75c1ff73f618b4c97480c3010e40f9053036b04d9b87a2d0d4631ba15e7093

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