Malicious PDF — malware analysis report

Static analysis result for SHA-256 176cadf60b245b9c…

MALICIOUS

PDF

89.1 KB Created: 2021-07-01 09:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 36b9ac07ee96c4d3da4dc3a1f0997eb8 SHA-1: 222311053e9d8eccd44187248287f02004cfaa76 SHA-256: 176cadf60b245b9c6f62c530ea7a44ab9cf42e30c2ac14dbb3cf87e19ca02830
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS upload storage or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. No scripts were extracted, but the presence of numerous external links indicates a likely intent to redirect the user to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://esipro.fr/userfiles/file/figoseretexosi.pdf
    • http://traiteur-ribot.fr/userfiles/file/foweb.pdf
    • http://begemot-rus.com/uploadfiles/file/2021050500442573499.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/196e3b4866b9e295eb9eaa1def2c25b1/95776038132.pdf
    • http://forter.vn/hinhanh/file/19410159198.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a255aeb5492---xazodibopuzemedide.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/9cstg9g0ddd8tqdb0l1qle6nf5/ropefiluzopoxukasezivu.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/48d3f9b205a7155897773e5847fec291/69716378794.pdf
    • http://asbu.net/uploads/FCK_files/file/zabisemugalixeg.pdf
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/kuvulegixo.pdf
    • https://toromecanicorodeo.com/files/50407704465.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a75621071ce---nilaz.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/8l5ek4lctp49jbkctt9c7660di/lalavav.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-6-29/20210629021035798664.pdf
    • http://davidhammerstein.org/userfiles/file/80892034594.pdf
    • http://adria-ex.com/images/blog//file/gogepegodafuto.pdf
    • http://vksraja.in/fckeditor/upload/file/69146681721.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/737a0055c10c235237968ad9a1847a17/56736759513.pdf
    • https://rybczewice.pl/userfiles/file/tufemumowona.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7689c2178---96480179494.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/0sqfhne23uujq4pjs19t5tvnvu/foneneva.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/640aed5f4cad09114402e938bf6e49de/82608299939.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/fb4d269e35b6392a2f3476d9ab48ec95/kagerolaxogiwatumix.pdf
    • http://ankaser.com/userfiles/file/79835586468.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+turn+fat+into+lean+muscle
    • 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_off0000f984.bin
ab137aeafe2c874a0a6beb8dd0f28bb9371638e74060efce2d88e4987cb4f76e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF984 10672 bytes
font_01_sfnt_off00011201.bin
ea4711bc245fbfa1fc2fbee4f345f8f56b69582de541354d4b2eaaaa4329b2d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11201 17444 bytes
font_02_sfnt_off00013eed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EED 16792 bytes