Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd351f57b922566d…

MALICIOUS

PDF

90.7 KB Created: 2021-09-06 05:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aaaa2895046a2ced16eae43d84ebf246 SHA-1: 9c8a8bafb92b2d48515e32a7378e3eec6bec5b77 SHA-256: cd351f57b922566d40a2d499bef60c47d7f925b8a071dcc67f2e8dff00c279be
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The file's structure and link farm nature suggest it's designed to lure users into clicking malicious URLs, fitting the pattern of a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sl-light.ru/design/img/upload/file/lifapukimabigo.pdf In PDF document text
    • https://oddluzanie.net/userfiles/file/fozevotalogepubitukolu.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd6079f2e9---divezimibobaxoxuj.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/zodatefiwewibomar.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/268c841eee24c66578a43aff92dd279b/tetafuxememamadovujezi.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/2400fe2df8b86576253c8ab1854c588b/63856938168.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/36045423476.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613027d1154d6---58165563543.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/lelt8i4oki5hs1ee57u1p25paf/60586904435.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/96ec4ab395a72330bac515a9a643a001/43924066568.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d67102028---7080849211.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/dar4ng20i0j7g11qcfv1b2hv35/87874686841.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160766ff67dbc4---82724565523.pdfIn PDF document text
    • http://houselandia.ru/files/27293317954.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/vuvidunez.pdfIn PDF document text
    • http://intergeored.com/upload/File/62171588683.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/50338f89011986b7297fecba96562a8f/defizoxewezababubaveto.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609890cbe76b5---50960883600.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607a95fa000c3---fikofopenupariwu.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/38519642726.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/7oc1mjqd38uafqbpc8hhtbgb17/99813731788.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/8889531370.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/dopukamisugekomemekisulik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=.net+core+2.0+tutorial+pdfPDF 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_off0000f84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001105e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105E 19428 bytes
SHA-256: 39b2f6fe7d03de0af88696ac2f9705576f48766f5f378332680031dcaf00e6ff
font_02_sfnt_off000142a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A1 10756 bytes
SHA-256: 0c34225c119ad63014a7bca374fecf621287e71115c8e0b232a0d79d50ce869f

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