Malicious PDF — malware analysis report

Static analysis result for SHA-256 84ddebd832b196a1…

MALICIOUS

PDF

87.1 KB Created: 2021-08-27 12:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 28f157794ba968474049dd7df1e57e80 SHA-1: d3fa588aa6bddd413105fd2cb2299284690f8e67 SHA-256: 84ddebd832b196a1721bc3e40e8e9785a6c738cc358ce19f2c7abb8783a12a96
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to manipulate search engine results or distribute links across various disposable hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c52df44bdce---85174913764.pdf
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/gabotozun.pdf
    • http://gorsilawfirm.com/userfiles/file/80342722436.pdf
    • http://orvosvalaszto.hu/uploads/files/63630895072.pdf
    • http://akkoryazilim.com/userfiles/file/doruxemuzubotexazi.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160f2ce787e6c6---gipolixok.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/82c3f2412c0b82a39004c956e4fb4edf/95624276166.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd905523e2---nupuzomokawivo.pdf
    • http://muacuoi.vn/Pictures/files/vetojuvoguluxazek.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161235e9c39035---dipumadupegivof.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/a92ibkau46o2soa9ui47f6tia0/57338764779.pdf
    • http://ambvet-trefontane.eu/userfiles/files/nisapujiwuvolazilowipol.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a7043eb704bd3ffec8ff7b404bee07af/59413172108.pdf
    • https://jcmimoveis.com/userfiles/file/73170683908.pdf
    • http://dentalclinicbangalore.com/uploads/jetukezom.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608271adbe949---molefutibus.pdf
    • http://gildiamasterov.ru/userfiles/file/tagegesuzi.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160959437df150---jovogavakejike.pdf
    • https://suma.ca/upload/editor/file/doxekopesewewisoxoji.pdf
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/74154096413.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da56fbdef46---wijevamafowipobojabe.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/cde6f5cabae8f247730197153d65519b/91542300845.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=number+of+joints+in+the+body
    • 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_off0000f215.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF215 16792 bytes
font_01_sfnt_off00010a27.bin
f98ea754185330a757fd699be03ede1212914bab1c1d310fb015f57c036af54c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A27 16816 bytes
font_02_sfnt_off000135c8.bin
d8b4001eb5f405cb1dc7fa04d49f04186cd35f3096226d6217ee4622319c90c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x135C8 10872 bytes