Malicious PDF — malware analysis report

Static analysis result for SHA-256 356e3e27f745e095…

MALICIOUS

PDF

70.2 KB Created: 2021-08-29 16:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9fcf5ba56c8fa609c052f51cc04f3688 SHA-1: c8ce40dffc1b4a37f9566330111cf70aa011f9f9 SHA-256: 356e3e27f745e095d1ae35bdc2dcc2f069bd4420b5f75ce098ed576c8524f631
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. Heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://zulassungsservice4you.de/bilder/file/rakakelolejosekonewa.pdf In PDF document text
    • https://ptkas.com/kingkong/userfiles/files/furomajizimiwigaxiror.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/guvopikofemuwisi.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607533477a329---josekodijutitewex.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/45074336029.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/jijokuviziwupiwej.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/feprcsotfb2cucap0mjkr0t3uv/93091693569.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/6e93f3fe06c48d778963afc95069e248/jifomejud.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/a27mn0si03m9ih3dh4e13t67k7/ximakubi.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/ba8b21158a3d95c5bec8134013e3be44/70330193629.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087c0fd5c621---peruxenireduvagabuniju.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/42341087442.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161080981e721c---tejanigupudoredifa.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///43634149993.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/rugotaworijum.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210808152233_bwrpg8.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6da26a7e7---59561854897.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/xexuremok.pdfIn PDF document text
    • http://temple.mo/userfiles/file/zogimosegiturosanu.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/67239760837.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/25216442477.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/1fe66dc8d1f26bbb14fa3ef3a7c9a957/pagaron.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/b8c65c5a7729e017a1719bedc8484f96/funazore.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/86795702121.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=what+coins+are+made+of+nickelPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB729 14256 bytes
SHA-256: 84ee2177e4526406918478427871ff5614c57421701a7ee90869b6217879d47d
font_01_sfnt_off0000da5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF272 10828 bytes
SHA-256: 6aea0891dab298326d847d0e53b01af4d3df2cb2ab1407a3d4ee470e93bc6d2c

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