Malicious PDF — malware analysis report

Static analysis result for SHA-256 42f1c489b17cec60…

MALICIOUS

PDF

123.2 KB Created: 2021-07-02 15:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2966042419193681626826db8568638b SHA-1: 2849fb9c90a2250727d6d33a6be24166baa3703d SHA-256: 42f1c489b17cec604cdfd3ad01a12ac9139e8289bbafe377e75afc7be19b5a8b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URLs are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://irlanc.ru/uplcv?utm_term=product+of+powers+of+its+prime+factors PDF link annotation
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/ik52lpnopred96421dvfoiq9q2/22343013414.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b80d8f7d472---239303861.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/xerosavixixi.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c8b534139056f29cd3b31dc30f5c1106/zimalijasagosakafuge.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160861710c1573---43154663120.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/gitaxinoxugusux.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087de4accd85---18980049458.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/pirapanele.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/aa7qpb9gommrfoppkbohlpq427/temopoji.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160959ce5cd6e5---74832217056.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/003e53eed4d4f98c3064b112bf126f09/56626892543.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1e94569e7d82ab22e78ffff43049f292/tilerunobub.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/925075141d77dc1893556f640f38cf62/jazimusejo.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a60d619cf---pugevex.pdfIn PDF document text
    • http://blueyee.com/upload/file/111423187155.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/pifavugesub.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b5a8055d94fcb398caf9087e7d5062a4/lirumiruxidugi.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/17337497014.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/61279872046.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/811bbd55e14339b424cf330e027527a2/jeliwanegi.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160adff7e419f1---44199798580.pdfIn PDF document text
    • http://erex.hu/upload/file/rujasiposaxodefaxes.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_off00018038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18038 17676 bytes
SHA-256: 6199edcf7e7d1e0f612f5197173c0ce37baf5d3ea907dd69350b6bbdbfa40fd4
font_01_sfnt_off0001adea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADEA 10816 bytes
SHA-256: b21aa1d20623dffbf635fbe08b134c1dabcc7c1edd1fc935882ea7f9052bd788
font_02_sfnt_off0001c701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C701 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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