Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f27e8950889ed49…

MALICIOUS

PDF

85.1 KB Created: 2021-07-17 19:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9ac79b55f23df6686385b30da2db5d6b SHA-1: 8b6e6e98ff71a3a716ed8a07441efc0e292944a3 SHA-256: 8f27e8950889ed4959e6676cfc90bfe81acc7882d326596a9b086820aa43349d
156 Risk Score

Malware Insights

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

The PDF document contains a link farm directing users to multiple URLs, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. No scripts were extracted, but the structure and URL analysis point to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d360704c74---lilazedofemixob.pdf In PDF document text
    • http://ateliergermain.net/sites/default/files/file/sizozavuguxiruwodukol.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1b8ca134b---25572753565.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/finumokipadujisojizo.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/9108574016ed542bf073ca3f2cfcdbad/getubapesito.pdfIn PDF document text
    • https://avenue102.com/uploads/file/32272352688.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/dda443065d9fb015b6fbf4960b3ec8bf/linigosatika.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//linul.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/073845e4254a2ce125ca200e6b1068c4/fifibepebegawarab.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/gazotedovizame.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160d22e02b2961---20115313375.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/36305f12616c46d787cbdd263b016f8c/rozonagola.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/b03a4c78428322f20558337e9a9c2c3d/28064307454.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c04df02b8---noviwodulaviradusi.pdfIn PDF document text
    • http://dgjst.com/upfile/file/tivitebezur.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c7842a5ff8e---rexetatedilopepaxezi.pdfIn PDF document text
    • http://ithaca1961.com/clients/875375/File/xijanifewow.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/lajakidawanomi.pdfIn PDF document text
    • https://mfdesign.hu/files/file/rajilupalewut.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160780e10a7781---40407805560.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/bemunufuju.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/vcfv95bchullq1ulegv50u2tli/49241137534.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=monomers+that+make+up+polymersPDF 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_off0000e824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE824 17672 bytes
SHA-256: d94d96ad74f82c30737145c9b4a551b25ccdfcd40d77197f5f11ba3b83dbdb9d
font_01_sfnt_off00011672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11672 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E89 10724 bytes
SHA-256: 33ee04bfd1ed180005f36e1db045a2a2359613e6c5f4ce3464ab474f9e2a35e4

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