Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9f92c67825d5ff…

MALICIOUS

PDF

88.6 KB Created: 2021-06-29 20:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e3b79dd5abd1e895b3b1ab68367aaebd SHA-1: f1bb1ff71e7df05e79338692fc8ad167b8eaa0a2 SHA-256: 5c9f92c67825d5ffba5e2ce270c89b584a53aed95bc91aa5916948757b830fb4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating a phishing or redirection scheme. ClamAV and ML classifiers strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing attack leveraging external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://inwebjor.ru/uplcv?utm_term=how+to+perfectly+peel+a+hard+boiled+egg
    • http://myappartement.de/web/editor/files/46960665680.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/05385c8d1cfcfbc8efa8c840378cbda3/koxibitabaxekopikekokiti.pdf
    • http://abwvictory.com/uploads/files/5390542074.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/19q5km0a2flcn9ou2msoi4lko0/15957153163.pdf
    • http://www.ecvbrass.ch/user/web/file/neneraz.pdf
    • http://nationshield.ae/userfiles/files/futukowe.pdf
    • https://dewalt-naradi.cz/media/upload/editor/file/55459507527.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607234d0d827b---nalukovalo.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2b9fa740f---69175379693.pdf
    • http://sun-green.be/ckfinder/userfiles/files/65482102381.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/678d41a7205f29950ec248b52d98f7f1/nipovudipeduxiko.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b0e5baf7a---69061615231.pdf
    • https://cubic.is/userfiles/file/2828560896.pdf
    • http://ipublicity.cz/data/file/jetolivejowadubupurap.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/0g54crihthq47mi130vkp8fqmt/3984589285.pdf
    • https://cottonweb.net/userfiles/file/dekugopolibajewele.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31718d2049---71526599527.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b36965125---26067388159.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bacdfa37653---49266562486.pdf
    • https://baatco.com/ckfinder/userfiles/files/baxapa.pdf
    • http://21cedu.com/pds/userfiles/files/jijelagosax.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58cd73a375---dagibopikoz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f580.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF580 16792 bytes
font_01_sfnt_off00010d97.bin
dc938a1a98defaed2fbcc79818c022f64ce1eeecfff5123dda583c8a7a808bdb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D97 10956 bytes
font_02_sfnt_off000126b9.bin
2e9bac921e4c531285ffdbc682d1eeb1c298a62a57ce8a77490034f35865838d
pdf-font-stream PDF embedded font (sfnt) at offset 0x126B9 17128 bytes