Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8502c65cde7872c…

MALICIOUS

PDF

81.4 KB Created: 2021-09-03 04:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b2a59019e9cdd53b1351fb301412da15 SHA-1: dbc9c4eefe9269973de6c573db04ff903c129b53 SHA-256: c8502c65cde7872cddd4305ecdfd1b174e8706e57fb6a4ecd6d20529d776afd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised websites and link farms, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, but the presence of PDF URI and link farm heuristics indicates the primary goal is to redirect the user to external malicious sites.

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 https://catamma.ru/uplcv?utm_term=balance+sheet+of+banking+company+pdf PDF link annotation
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccb00d5173---63338075436.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ki5bs5cfgtol2e10o4mgp5ovmr/sowavobo.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a22cfe5c4d0---96901837449.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c5a925db8---mofokumi.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/96062852249.pdfIn PDF document text
    • http://abc-tel.ru/data/File/kadegotixarax.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b358b0787c7---xasitemazisipumeripolul.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/1954f0a220a128cb70a330dbac5d5f8c/zobalupet.pdfIn PDF document text
    • http://tuccifamilyonline.com/clients/b/b5/b5aed9f4ae8fd2b300021b46b426cae6/File/katit.pdfIn PDF document text
    • http://ruresept.ru/files/file/wodesebizofozesutisupurop.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/ifiqbg9m5ihkvpbvrnglll1ulb/12491941013.pdfIn PDF document text
    • http://cloverdiamond.com/file/wugoliwu.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/c7cefab40b9eccfef9dafdc5c9a7f5b5/sosoletosujila.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210713124333.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160868c88edf0b---27897836388.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/3724795273.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/bekipupomimibidapanapipul.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/50211240423.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/788f5308287ddb13ed83135252fb73d4/biveveselitejubajugagonoj.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/zopogilenovopiza.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160809ecb65019---72878763057.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/25282160685.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/xumazowaxobobajilo.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/72093541827.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_off0000d977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD977 11364 bytes
SHA-256: 752ff09384ce65e9c86d8b007f99447690ee090790524fe92802d6bb59586662
font_01_sfnt_off0000f3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AC 16944 bytes
SHA-256: ce4cef792fba81dd8564e10c60778ff7a4d9daf21a9b5006fb31b4bf7e7fe64c
font_02_sfnt_off00011f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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