Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb02992d18959e99…

MALICIOUS

PDF

80.4 KB Created: 2021-09-01 21:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 41ba7644c548e984fa5258e472426bd4 SHA-1: 187654f9f403c2cea86d0601a43ec6e26b91f5ec SHA-256: bb02992d18959e993158a3be1a25ef0ffdd0ca8d158158377a8b5dda81b4d27f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to manipulate search engine results or redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/68647b308fdecb685654ded4f3d91fec/zikuzemijasibiditelot.pdf In PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/19448602827.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/322574ba514033f109aac25f7c392a65/xesofipofuwujulog.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/47183550371.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/pimejumifod.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/32041960736.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/75330156822.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/93600646770.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16074338d7fb38---kufofob.pdfIn PDF document text
    • http://deckdreams.com/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/54346192034.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/mokimasijoja.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/32617252680.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/12029214342.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/48252196131.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/1rf7126orhd48clnbld2isfnes/dudutizonetutomilabef.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/gufunanagu.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/00152e36544a167d585a7db50deac39c/gamekoluferowilepabotuf.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e8c41ec5570---gopexetediwivubopemod.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/26645748219.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2cd85e131c---16186875582.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/uboo380aednko75pa3pmmrp1jm/97773790149.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9268aadb43---67715814142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=types+of+non+disclosure+agreementsPDF 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://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_off0000d851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD851 17012 bytes
SHA-256: 97f516ee50806ef0e3bc368488e650b4b0049c0b7b4d92fed8e0502eb92e57f0
font_01_sfnt_off000103e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E0 11140 bytes
SHA-256: 1c4d0435169ef244b2905e3fe307c5ea509037142efd491c74daeca5a846cbd6
font_02_sfnt_off00011dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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