Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa217c8f364b386…

MALICIOUS

PDF

73.3 KB Created: 2021-09-18 10:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1341d767f0a75729fb17bdd8d91cfd12 SHA-1: 42c4671ed74a49eff8724c9ba8e3e438ae4b9adf SHA-256: 5aa217c8f364b386f7c34b7522b773ebbef9b61d5b282fb43e4f08444788e22f
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. Additionally, the document features a link farm with multiple URLs, some pointing to compromised CMS uploads, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trevorhannant.com/26547536650.pdf
    • https://eliteplacementagency.com/uploads/files/69309856759.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/d67727mu3bd869iu8rnobihr32/sinopalalanotex.pdf
    • https://matratva.in/userfiles/file/15838133510.pdf
    • https://plagij.at/ckfinder/userfiles/files/24291493077.pdf
    • https://moraure.net/js/ckfinder/userfiles/files/feresabuk.pdf
    • https://specialgarden.ro/userfiles/file/mazugijefi.pdf
    • http://geombiagioschettino.eu/userfiles/files/mixedenozukufivagekavu.pdf
    • https://archielectronics.com/userfiles/files/59447268889.pdf
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/kaniwega.pdf
    • http://aerotechgroup.ru/img/outer/files/xusometebexazo.pdf
    • https://manpowernepal.net/ckfinder/userfiles/files/57052369300.pdf
    • http://theloanwala.com/userfiles/file/47367868579.pdf
    • http://selmanoglusigorta.com/userfiles/file/79417223486.pdf
    • http://otohondamientay.com/upload/files/lizanexofosemelizikaj.pdf
    • https://lhorizon.ca/uploadHorizon/file/tuziwowulurajebexidax.pdf
    • https://eventpro-kontraktorpameran.com/uploaded/files/wojeduzusot.pdf
    • https://fablab808.com/nbloom/fckuploads/file/19476947126.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f51d0415df---57528014348.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134268ac0d2d.pdf
    • https://globalathena.com/ckfinder/userfiles/files/vewuluku.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16133118c0b36a---figukasebagasufekemew.pdf
    • http://aromacosmetics.bg/assets/userfiles/file/xibiri.pdf
    • http://stadion-zarya.ru/ckfinder/userfiles/files/mijatepot.pdf
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88506313582.pdf
    • https://italvaping.com/file/pelesosoriwapezow.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=the+plague+albert+camus+pdf+free+download
    • 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_off0000b841.bin
9788b961c775dce15ac5835fc6410176ff7c410470b29d29d2250d45d311feec
pdf-font-stream PDF embedded font (sfnt) at offset 0xB841 11264 bytes
font_01_sfnt_off0000d231.bin
9fba080fab449353c72acc457b1eb521514fe715bbd0e73e8d9b8e245818c09c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD231 17280 bytes
font_02_sfnt_off0000ff31.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF31 16792 bytes