Malicious PDF — malware analysis report

Static analysis result for SHA-256 94d3b8f52113923a…

MALICIOUS

PDF

75.1 KB Created: 2021-09-03 19:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6fb24c2a2778a406d165d26460ef5aeb SHA-1: 74b81f8e7f8136fc58483906810d505839e5e8b8 SHA-256: 94d3b8f52113923ace44ab0b7bc985c41f2004009098f8dc879e857e3bc1f84a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://huntic.ru/uplcv?utm_term=degrees+of+comparison+worksheet+for+class+6 PDF link annotation
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d961c238fc1---17840852264.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/b181c7327bac677a8a8b3878866b0142/ruzatewinijebobadegileka.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d7a702e6c---66809814800.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/zapolip.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160986352b457b---42705776896.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/jagigipofulepumesux.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903af87b66c---84374562138.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/94284709084.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/69908866611.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cd10e4c0c40---51529381230.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/92197676414.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/9689631186.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/vafefawixenosi.pdfIn PDF document text
    • https://tdfstore.it/file/jenowemeg.pdfIn PDF document text
    • http://retrofotr.cz/files/file/70614160921.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/12697393163.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cb014251147---4834149136.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/gefowiromafutugugudozaj.pdfIn PDF document text
    • http://exosushi.com/uploads/files/88390083698.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/18961896561.pdfIn PDF document text
    • http://sushibelovo.ru/files/3822096086.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/83165793884.pdfIn PDF document text
    • 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_off0000c23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC23D 11272 bytes
SHA-256: a11b188f84bffe942d016ee7d1329b8928295a2443b5a6eb36f97f20775d2a9c
font_01_sfnt_off0000dc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC94 16572 bytes
SHA-256: aefec1353fb2a5fbd43a8c3d1ae8adf700ea1ed027063d7579191fdf44252588
font_02_sfnt_off00010704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10704 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1