Malicious PDF — malware analysis report

Static analysis result for SHA-256 787581938c5adcda…

MALICIOUS

PDF

93.3 KB Created: 2021-09-01 04:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c1926ad2f079982919e7accbcad0b0b1 SHA-1: 62ac695ae3fe09fe352966e1dcbd1b03f6cc93d5 SHA-256: 787581938c5adcda853ed88c0ee590abcf86395f929a97be266d7b17538b1973
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs likely serve as lures to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://queure.ru/uplcv?utm_term=expression+for+fermi+level+in+intrinsic+semiconductor PDF link annotation
    • http://fouladsazanco.com/Upload/file/mavoxip.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078842eeeba1---zalitagedikezebafe.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/rebezafurizuxipusituvus.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/72269011268.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/51127528618.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086c736b114d---24102134164.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/r84lnc6ug5ojh51jue901to2t5/61086413929.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd3ae6d408---fopavefosire.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/57891972825.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/eb00a5c8f330f806578670fdb0ecd11d/wivapavevigozurexebemo.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/53b240383cd52f0efdba0c3ac46d6d16/safexixi.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/27540220772.pdfIn PDF document text
    • https://steammining.com/userfiles/file/punarelijijo.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/fitaxagakedojavo.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5b6953f24---zokogakerutuzosomibi.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/41876276049.pdfIn PDF document text
    • https://purefeeling8.com/data/file/gudag.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/94999196293.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/d2ff930e1bff132619b34aa1d80afdaf/tamovukefuba.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/6d291dd14ea939c502c4584f27605532/17198484513.pdfIn PDF document text
    • https://primer-spb.ru/files/files/44802641121.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c56cac1e54a---kasazulomaw.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/91213644569.pdfIn PDF document text
    • http://avondale61.com/clients/e/e2/e25739fb73bf6f2fbed92e75d980d6c5/File/nijekax.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0460ecec3f---rarerixitafafule.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f992af03b6---32652684824.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_off000101c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C5 19304 bytes
SHA-256: b0aecfd3d81128bcad7229818d0eff210f421c20fb26f066e99dc38d4bc152fc
font_01_sfnt_off000134b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CD0 10868 bytes
SHA-256: b78ebefac4c7c6688ce8686d4e299c4646de76faa60bbd6eb240dce5a073af44

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