Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d1f9ad778436366…

MALICIOUS

PDF

80.0 KB Created: 2021-09-06 06:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: aef9472695f7bad7f21702286708af57 SHA-1: 7c93ebb4bba16b5d4cfd6bf549646becf36d135e SHA-256: 4d1f9ad778436366faaeca2ff028162f0811882ba1b9a32f2537ce8e22e6fc9d
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload locations and other disposable hosting sites. These links likely serve as a distribution point for phishing content or further malware.

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://bielle-srl.com/userfiles/files/pefakemiwinunes.pdf In PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/ecc1ebf939f7800e7056454f90892863/49694215246.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/12a8374a5aca58f0a859a32345d4ef44/winexepofewigizabek.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/2715330081.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/kuzakarakukuvobozotovu.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/1quta9hsal4j69gmgng46j2kvb/22268293727.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/174db825e113ec44c02748a5053d4ea0/nazalomir.pdfIn PDF document text
    • https://cape-electronics.com/media/file/62267399200.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/tevek.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/77521615056.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/j3311img73te7ncehokjkq0p97/15526011054.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/pepivasanoxepik.pdfIn PDF document text
    • http://liyangah.com/Upload/file/55736226345.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/vegigamedozamag.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/muribisojexediwixutujeg.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/98f4bf7a11722d26bd06271b207a123a/pugekejalat.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/85205984543.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29d5972e0f---50258826998.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/c04bbc9af67fda7fb8f73017a47e1be4/mugasigaxopopir.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///xuvusepaze.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609dde0e54069---33759447636.pdfIn PDF document text
    • https://isosklo.cz/uploads/funekafiwejivike.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/fafikatovezoduwujulaluwex.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/39721884952.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=inferring+worksheets+grade+3PDF 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_off0000d28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28B 10888 bytes
SHA-256: 86da7093e445f00b1623bfa1a5d9ffb9730214443c7c1b81111833469187d819
font_01_sfnt_off0000eb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AD 18292 bytes
SHA-256: fc3a09cf06afbb9c55f832a6f99576a8ea67bbadec65c49218286a6d6eacaad9

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