Malicious PDF — malware analysis report

Static analysis result for SHA-256 246371bfdaf1b870…

MALICIOUS

PDF

68.0 KB Created: 2021-10-01 08:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0259d217772e3a909bad9a39015c2c86 SHA-1: ca32b3852def0c40684c5672a58640ae27f2644e SHA-256: 246371bfdaf1b8708ad590a97689a385667ed5d9beffa2dd61725ebee3a0f0e6
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple disposable hosting sites, a common tactic for distributing malware or phishing content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of numerous PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://aljuboori.com/userfiles/files/43490875487.pdf In PDF document text
    • http://hanceperline.cz/files/file/98746310816.pdfIn PDF document text
    • http://altera.ukrstroyka.com/content/xuploadimages/file/64547436350.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/kesijuxilalimusemedo.pdfIn PDF document text
    • http://charivne.info/images/file/55861458136.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/perilevuko.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/10855021648.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/belebunozefunubitagi.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/seredukepip.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210916071913.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16148fab36a9de---85297838832.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/35984543998.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/kenovilogabeji.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613895f94aead---42924900546.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109220159396605.pdfIn PDF document text
    • http://retailcop.ca/files/24844913078.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/kububusoserawiwom.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161567254170a2---kemaxaje.pdfIn PDF document text
    • http://meteoratourismactivities.com/files/files/22207041558.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/55275006665.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=download+game+ultraman+fighting+evolution+3+androidPDF 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_off0000ab24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC33B 11060 bytes
SHA-256: 2ceaf3f4641cd50002c56e4f8c104e1e692287507f85d0667dd4ccb19cd0720d
font_02_sfnt_off0000dca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA5 15128 bytes
SHA-256: 2a98f89fe5d7d89782d5dcc69a6ae24a97be4ce4a4264a0907a29b1594e967e7