Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f32e3cffb7dafb8…

MALICIOUS

PDF

94.3 KB Created: 2021-09-04 10:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6450fc029cabb548bb5d975d06919e5d SHA-1: 076f78eb2c362dc48ba94c2785bcc491ed05a1ea SHA-256: 6f32e3cffb7dafb8ba31c3f700a6553c1906115494c9ee2b391e6d3094080cf0
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://smidgel.ru/uplcv?utm_term=siddharta+hermann+hesse+pdf+italiano PDF link annotation
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebf0ebe231---fefarajugupogaz.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/77512551699.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/37349842363.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/65749634510.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/5a7410181bceb9a922f8d3e4db2ca2d8/sataxopapumelik.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/07eb88a3a2c3c6e2dc0eb8047c63128f/15223008960.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942912c85b3---95358406346.pdfIn PDF document text
    • http://pbsdeltarho50events.org/clients/d/dc/dc3fcb918f61c9276c5829b035df2abc/File/votizoto.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f0c5b7885---nanitutabifubajowa.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/29043713569.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/71442592090.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/71713003171.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/gabofezilovituf.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609109ad3c69d---pufebawopabotewa.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087a08caeec5---86942135929.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/79052276854.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/35843185703.pdfIn PDF document text
    • http://haworthclassof73.com/clients/73472/File/55597732351.pdfIn PDF document text
    • http://valaptop.com/ImagesVA/file/8564318842.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/24637991403.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/dotugik.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/5521d8d6df555a771fe77cb22836bca3/betonuxanimu.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160942d116f2de---67029976627.pdfIn PDF document text
    • https://funbugs.ie/files/file/96702046347.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/92721094021.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098942bc7f6e---gulixetawawidozataxu.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_off00010686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10686 10836 bytes
SHA-256: 313b8f22696760b2a9bccb0893de0006d0bc92730b715f4b85707b2a25ad980f
font_01_sfnt_off00011f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13762 19680 bytes
SHA-256: 511a843367ab7287cd948de16e5c46b09560da5665d75c61ca1b1e54f70781dd

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