Malicious PDF — malware analysis report

Static analysis result for SHA-256 b165e20ab430b9b0…

MALICIOUS

PDF

95.9 KB Created: 2021-07-06 06:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 601e2fecedec1bc167ad6f692cb5ac89 SHA-1: 063b49d1c780c386f11dd0ccceaadaff95d0c3de SHA-256: b165e20ab430b9b0ee35600b972a47dfd9d6313404e2fe49f261067ba4a027a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. No scripts were extracted, but the presence of external links and the overall structure point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/5619e2cf4fdf08d67282ab639e277ee4/sopivasebido.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/s4f9gfsi844e3pdutntehgg7i0/42459181110.pdf
    • http://wang023spa.com/userfiles/202106file/2021062709041170554.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/rvkciekljts8hjaa2prngdpr8p/witijirebiwemejokitoxok.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/0c2cd4bf19c1f82548861dcd24efe5e1/14342550797.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/brd2km3bcc9pcm94qj2paun4oc/46436412964.pdf
    • https://businesslife.com/content/file/jixesuxigipojafexo.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609212dd48d53---fubadukixata.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714a9b45fd6---kopijuluduka.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3ccbb9a30---selekegoganago.pdf
    • http://akcjonariusz.com/UserFiles/file/rukevalugopojolemu.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609010d331fec---kovumumujo.pdf
    • http://dgjst.com/upfile/file/37941116092.pdf
    • http://pobierzplik.pl/uploads/files/palemarewomo.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/2c8963952a6e1c6e75d2cdba9e042779/pojolojajavowajedom.pdf
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/28533027439.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/90f14a057c161385c5046f8b10057449/juvovatepenapa.pdf
    • http://aytekinpolatel.com/image/files/mipojarugiseseserew.pdf
    • https://kawanmto.net/contents//files/pupenarejatu.pdf
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/69191226429.pdf
    • http://bizbecho.com/pa/trainstation/uploads/image/file/40475782662.pdf
    • http://amon-syotengai.com/userfiles/file/segugopuredezorotore.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccaca43e29---futarudunanigujozuliv.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/1423ee6a5636bd5d4e7c5bf5750c86ca/faxifezuz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=order+of+deacons
    • 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_off000115d1.bin
811be737f1b77b00c10a4e5424b25e012e81d0cc106ce88f533c967c17f6db0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x115D1 17296 bytes
font_01_sfnt_off0001432e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1432E 16792 bytes
font_02_sfnt_off00015b45.bin
3b860b11e1f1878d2b6e1b036041b99238953b51575db6870fd03323504121af
pdf-font-stream PDF embedded font (sfnt) at offset 0x15B45 10260 bytes