Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d25c9f9919e2f54…

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 02:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b3b1b3b2249ae0fd70f33967a0436e56 SHA-1: 0d1034508dd0db328730998ff3b1277912ddfad4 SHA-256: 7d25c9f9919e2f54e77439660f5fd0a26174b9c65c7c80f3f3cbdc6efe460a2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload storage, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=final+fantasy+dawn+of+the+future+pdf PDF link annotation
    • http://vasekurzy.cz/userfiles/file/40631678736.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/zujagibawo.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/mekokiji.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/56300175324.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/vomopota.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/bulepowetudavek.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/fegulajururosu.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/sofedutofawabereriwalifi.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/pudubakok.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/52019325982.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c2bae2700---57179531826.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/d55c6846e4b44aaf4ef4ae6d9f9c5e00/rokifivufuvotajake.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/10296667331.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/35422339252.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402f464af69---14225621384.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/segoligegukoko.pdfIn PDF document text
    • http://youil.org/userData/board/file/60655628283.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/9440pufmov525nf6sifhkoea2i/70475600880.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/nukopiz.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/fuparadowofozumimomonur.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/45625850052.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/talazilemi.pdfIn PDF document text
    • https://ismart99.net/upload/files/94696886441.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/65487805080.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/56950278446.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_off0000d79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79E 10872 bytes
SHA-256: 4343bb55248212497c02a9e26bd74948383fe929cb067e3b3cc94586eb2208ff
font_01_sfnt_off0000f0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B6 19076 bytes
SHA-256: 2b18450c4c5ac4676cd94aa28b4d2468de17b6e17ebd3a37bb38e255dd15f83c
font_02_sfnt_off0001221d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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