Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ca5c180b53e168…

MALICIOUS

PDF

79.6 KB Created: 2021-09-16 23:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9397968a3f08ddb9ecf53bddbfec9af2 SHA-1: d29150fce352b66406ebc4ca8a158d9acc88bd59 SHA-256: c6ca5c180b53e16814c2704be9832bb7805f08f9ffc83abe08730eaa6cb34983
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a phishing or malware distribution scheme. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://philabc.ru/uplcv?utm_term=the+best+gun+in+warzone+2021 PDF link annotation
    • http://mamaskitchenorder.com/uploads/files/duxepinefuxek.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/zapofoganepusorugovum.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/85639034811.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aad91249f2---gezuxijisejeduxufuribekax.pdfIn PDF document text
    • http://landpas.pl/upload/file/97685359446.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210913_164929_4242.pdfIn PDF document text
    • http://snkpost.com/fckedit_file/file///20210903_19_37_44.pdfIn PDF document text
    • http://holzbau-napetschnig.at/10152291436.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/zojezikew.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/70010832810.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/998f0f909a531f0cbacbe6c9f99f850c/gepuvakezufiwun.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/88061166970.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9c45ab76d---31721967700.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/pofedesos.pdfIn PDF document text
    • http://iscelenie.info/files/file/paliragekomete.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/80198648968.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/33652671882.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/91348971097.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/5120532090.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/47981174565.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/dositavuzu.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/mivibaf.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_off0000d343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD343 10984 bytes
SHA-256: 1630394e4f06f24a40b2dfb30f3c3fb254e04dec51ac0ea928ed45f62a665294
font_01_sfnt_off0000ece9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE9 17280 bytes
SHA-256: 90010c4f837bcd71955b842a3fa5c56150b7a8175ab2494d798ca524df724ee1
font_02_sfnt_off0001191e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1