Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c5f636cd6db34d…

MALICIOUS

PDF

84.6 KB Created: 2021-09-05 20:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bc7b159c07bf2cc7e466ae5c0ad005d7 SHA-1: 3de2990a6c3c05248f7a032a6d678505fb021508 SHA-256: 19c5f636cd6db34d924debc3d30885add1888771aad8a3a0af74fa8b719908be
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or appear to be disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/03oevg7bmqi9c0c04fcl6s86k5/49573061102.pdf In PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/2936684358.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/zanof.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/82348155247.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/ruvoboxalilip.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/tijoferexurilofaru.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/juwej.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5a23399f6---dapivapakodo.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16092c6ffc450f---18989691911.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/sebajikuve.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/j7eq0mq0hfv0u93cpd2233rk1f/pavanalasilesit.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/77503315673.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/c5qb0fc9or54npnlrsm8l1n034/miseneparivewak.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/48228756287.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/s1lab1604ssubimc26ia9e1mmr/98662649900.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/74792212439.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b455cda0107---zejefufugelifi.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e944abf2620---88269945606.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/74505968994.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/tefexof.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/43235296509.pdfIn PDF document text
    • http://sansboundaries.com/clients/f/fd/fde0d4b6b324343791c5f0705b221951/File/55126263742.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7af0e8980---wafakofid.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/wozupuzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=biology+handwritten+notes+for+neet+pdfPDF 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_off0000de0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61D 20228 bytes
SHA-256: 43a3292b4f64b8d32339e38a11cc99ca3dfea70366d7aad08206b1328c2f22dd
font_02_sfnt_off00012b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B46 11028 bytes
SHA-256: 9078b0a0802144f7d1edfce1301f9645a8129d3a1c7832cc452f5b5f27552854

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