Malicious PDF — malware analysis report

Static analysis result for SHA-256 066f6a7fb19c2924…

MALICIOUS

PDF

100.7 KB Created: 2021-06-28 02:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3dac1c28df6061ad2fcb3d16f647cb70 SHA-1: 7f776cbf87a82f3f5462b582bb4bb9173b73bd94 SHA-256: 066f6a7fb19c292416d0dbf7145e6fe8e97838b55f9255dbfe7366f0b0bf4c7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://bmcnx.com/userfiles/file/85946650539.pdf
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/72712339442.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/hfvqivgdmrnao239nbt9fi8npo/vivejeni.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/5344649234ad1ee75e1077edd04c4f53/zowarumopu.pdf
    • https://samngaimarble.com/html_upload/file/31900194010.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/8445f58cb847fb26bca27d9dcbcbd329/tunuwigudivasemilid.pdf
    • https://nanosoft.mn/images/content/File/19295905483.pdf
    • http://rilta.net/userfiles/files/rogifatipuzuku.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/240d25cf3c51d30a6b407822a9d538b3/79046164905.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c949d167ebb---mopekugefasoruzowozi.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/c0f2454022c30001ac38f3cf06f91822/31251933077.pdf
    • http://oaklandscreche.ie/userfiles/files/65320753547.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/bbe6c91ceac8c4dae3159e8e4b68fff5/lejafojidomajorodewa.pdf
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/l5u1ln9srmiukhif6sr28lbuot/49819143586.pdf
    • https://gw21.ch/uploads/userfiles/file/6590311785.pdf
    • http://anhopphat.com/uploads/files/japirekivupugabika.pdf
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079dc477122b---49386828409.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/4e5e0f91d152dad2b7e2cc2f9594b02c/pipipamolonarawebo.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/776084da8c2aced27519b4806fa0c5ae/65931338705.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/o3622fcdd9cqptgv3668eo2n8u/7204250837.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726e9dd828a---37280955498.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=shakespeare+as+a+dramatist+essay
    • 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_off000127c9.bin
428f02c1126670749e8a78841a34400a3fbdc3b6f3df23bf8c00f72268c36ce7
pdf-font-stream PDF embedded font (sfnt) at offset 0x127C9 10668 bytes
font_01_sfnt_off0001404a.bin
6812a439aab5707254698c65d6d20417d727dc5085d282f0903da03550e3f36f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1404A 17300 bytes
font_02_sfnt_off00016dae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16DAE 16792 bytes