Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d1b2d29cc258db…

MALICIOUS

PDF

93.3 KB Created: 2021-07-06 09:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e13cc6c3096b417ccccf30ef25d0ff7 SHA-1: b369cbc2731bc72c46f11d60eb6ac173651cb908 SHA-256: f5d1b2d29cc258db37f61604846e7736a6d08f757622405e075c91953ac6fdc5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to websites that appear to be compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide clear textual content, but the heuristic firings and URL analysis are sufficient to determine its nature as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://toskov-yordanov.com/userfiles/file/rojedusanomefewodap.pdf
    • http://syuncyoku.jp/upload/file/wogowawosoteperenatimuzax.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e5ae31eff---30369050679.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a29fc6fac8---pewewagulomebenuwigilovi.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16082947c0488d---xudesug.pdf
    • http://jagodkaprzedszkole.pl/userfiles/file/gogolileze.pdf
    • http://sistersaviopublicschool.com/userfiles/file/tinofoduvedulat.pdf
    • https://www.avantagesapp.com/uploads/files/9843906295.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/5be0b8173b7e77d6ff4882e35ea68da4/22364824761.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607db057f1692---fumab.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee1404ff0e---96001094566.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/tafagerivoxemav.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/ec96b9d69b791d580833c99bebdfd144/1826039328.pdf
    • http://rosniyom.com/userfiles/files/10840997069.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/2512f50d6600ccdc42334bb4d99ea779/72714156210.pdf
    • http://oodow.cn/upload/file/210609200738091614hfycgaug3ak4.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/b64d35ed6ac5938b74df66533615adc5/58919423401.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c86606aab44---wigukizamitegamoweginowen.pdf
    • https://bamfieldrental.com/userfiles/file/wosek.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/c865b6ffb1808a64ac6d3f54a6c6ee75/86232573851.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/cf4378dc1fce71105913da990e12bf5c/mixavapifarakamawemeduwap.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/0d53eeb675dea9d3e650ee35453ca737/vilupokedodusakidakuxu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=an+epitome+of+meaning+in+marathi
    • 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_off00010b0d.bin
40d5cf2446abc3a7f6f7e206025b58f1aac06bca39d67d484938de03c9a27606
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0D 17192 bytes
font_01_sfnt_off0001380e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1380E 16792 bytes
font_02_sfnt_off00015025.bin
c30b70c6d4ffeadd913d486197b2f2fee2d7e173c043ff58595ea76031ff66f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x15025 10572 bytes