Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffd46c7f5bf5a53a…

MALICIOUS

PDF

83.7 KB Created: 2021-09-02 14:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 27b0789458c9be67919dd440d9080c25 SHA-1: 6a21f6c52a1d4a6d389f0d5aec257ecf2f58156a SHA-256: ffd46c7f5bf5a53a11ecc16837ca20df8ed5a2c946780c3866ec44ec290571af
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to external PDF files hosted on various domains, suggesting a phishing or content-distribution scheme. The presence of multiple external URIs and a link farm heuristic strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://influences-vegetales.eu/assets/Image/files/34022364570.pdf In PDF document text
    • http://momsystem.ru/public/file/66425946063.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/65727097076.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/18988794274.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/12159240939.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba612219b---sarezakuzozifujokanusago.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210827215139.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/4cp10tc7n72o4riiiq0qcbpi3c/xudimedoworasopuvoz.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/25984475490.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/94747005018.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/vibimi.pdfIn PDF document text
    • http://bdn10.cz/files/file/61039972614.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021062607083373499.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/cd7f869f5e18ded62ad74249450f60ca/97531633959.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/3d52ca9c1dc88523289067825e858f69/96591014624.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/19519261057.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/410115db913188dbeb7e2f262230b3d4/lisepopido.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecf3ad5f9e---92904927119.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/57588574410.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/wamapegapiwabijoxaxepib.pdfIn PDF document text
    • http://usatovl.ru/upload/fckeditorfile/fonoxalewun.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/7551935102.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/f147f3e437fa107aec1b77a571474aa9/49219468582.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/46444173652.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/lebubunamovawak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=broadband+vs+baseband+pdfPDF 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_off0000e25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25C 18008 bytes
SHA-256: 4803d861b28d77ad65cc974ff478e59d557a62abc1d5a7789cbf6c54f816ceb1
font_01_sfnt_off0001110c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110C 10516 bytes
SHA-256: 693ca7768868024b0f886f892c137e27c78bd3b62978e5ea18bfe902cfad6b29
font_02_sfnt_off000128e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1