Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d9ec55646a53d1…

MALICIOUS

PDF

81.5 KB Created: 2021-08-30 22:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa674cf7951122953eb46b2c103c43ae SHA-1: 68f22bf70daa37a67bf41eeb15dbf69e6b4efc2e SHA-256: a6d9ec55646a53d1acc3a9a593619f0640492295e18bdd27c8d0ae3b614d8910
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms and utilize disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a link farm designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://allytemp.ru/uplcv?utm_term=contract+of+indemnity+pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a7e27d3fb7---86153477047.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1429222efc---buwotutixavipeb.pdf
    • http://pfmconsulting.org/survey/userfiles/files/50317555314.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b44ed48a6b---palibobejebalegapu.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a4661516c---rusogudopetaxo.pdf
    • https://energooptima.hu/upload/File/56093078395.pdf
    • https://easy2ticket.com/upload/files/satozinerorolud.pdf
    • https://bangprice.com/bangprice.com/beta/cms_image/file/19948676495.pdf
    • http://jatyn.cn/upfiles/202108/file/1627938150.pdf
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/neteketox.pdf
    • https://bbpartner.cz/userfiles/file/15867063312.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/8f2bb707aeede070d8b13e309451abdb/vekukepevujiradaneja.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2c77f46958---20178590990.pdf
    • http://www.cpiequipos.com/assets/images/user_files/files/wokufufuxixarorudo.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/32ktn3m3i6ks09sl0qe1bpc3i7/dugajotibutademi.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c22556e3a60---60285531380.pdf
    • http://erictex.com/ufiles/files/poduzefofukuke.pdf
    • http://taxilitomerice.cz/ckfinder/userfiles/files/fesutiwefagujuliwosabixov.pdf
    • http://avs-market.ru/admin/ckfinder/userfiles/files/vekikalokagamofapate.pdf
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/91986652530.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b331cd8d570---97301841479.pdf
    • 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_off0000d890.bin
14411f0b778be92545a67abe71e9eac343e4c42f320b52fa6541676f7b863c43
pdf-font-stream PDF embedded font (sfnt) at offset 0xD890 18028 bytes
font_01_sfnt_off000107c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107C4 16792 bytes
font_02_sfnt_off00011fdb.bin
027cbb9f22b77b7f49786a2061137794a860595c90ac91d0a5ee80349b2de6f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDB 10712 bytes