Malicious PDF — malware analysis report

Static analysis result for SHA-256 95c1243448b00dab…

MALICIOUS

PDF

92.2 KB Created: 2021-07-13 22:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92f62f1a9c5b21fe66d20a5ceb41d9f2 SHA-1: 94c1fe39dd35ee62da5d4c23325afb996657a4fc SHA-256: 95c1243448b00dab4ad2439894eac78b8e5097987da66506c814930b4c8fed1a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits characteristics of a phishing lure, as indicated by the 'SE_INVOICE_LURE' heuristic. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting an attempt to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of embedded JavaScript to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://botosani.ro/img/uploads/file/11829260066.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a69459420---jamajonakevutuzopa.pdf
    • http://ambvetfanini.eu/userfiles/files/51374116996.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/3df4ae7797c909ede8953c16a7feed8b/13749252416.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c83fe3247---93722416224.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd309b3a2c---28672378928.pdf
    • https://ratsimae.ee/media/contents/file/88825790620.pdf
    • http://svsteinfurth.de/radsportfiles/file/92088345345.pdf
    • http://abacusnancy.com/userfiles/file/65736564361.pdf
    • http://from.ua/upload/articles/2021/06/15/files/vageput.pdf
    • http://kengosushionlineorder.com/uploads/files/semonizesikafisi.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/805732ee6d49306b383ae2ad1755daae/43942890041.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/i0u92pf4tc5raoks2em93g07vm/54858045337.pdf
    • https://alperbehang.nl/userfiles/file/68120184725.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f52a620bd---21690318751.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c37146cd53570a411bea55691ba6afd5/kedab.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe0e4cf22f---67141817908.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/d2a3b4f504b60a8748716e76ae5f0b6d/xutazidufuge.pdf
    • https://girilawfirm.com/content_files/files/78683815847.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714de9d320c---10718884147.pdf
    • http://lyjclinic.com/ckupload/files/nodekezoripapulodab.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/b97cbb71f0881c6914628fff63cb61f5/94013548368.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/22164871555.pdf
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/fe6f9d36d42ac760df24bffcfd256fd0/kanoraw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=defer+state+pension+pros+and+cons
    • 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_off00010708.bin
656e65ff8752ee73070d4f10e52ecfcc62556b75f235531fe3f8513878f2e6f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10708 10568 bytes
font_01_sfnt_off00011f47.bin
f61a5cd4724d8a2dc7a1df724802f196930a31ce31548c6193eb1d2f3d3bee4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F47 16644 bytes
font_02_sfnt_off000149f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x149F5 16792 bytes