Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff0e452eaf0a3b66…

MALICIOUS

PDF

84.7 KB Created: 2021-09-05 23:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 89bdae0a4019122656b6375f4841a000 SHA-1: ff4fbfbd3bb5be14b6e4a89dffde135a70d6b476 SHA-256: ff0e452eaf0a3b66b96d03b0c865a3e701e2fc278b60690b9ce144f1a1a05abe
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, limiting the analysis of direct payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nomylo.ru/uplcv?utm_term=ipcc+climate+change+report+2014+pdf PDF link annotation
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/25528326528.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/fudasupuzokuranarulat.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610dd3dfeeb39---99454586070.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/2103733111.pdfIn PDF document text
    • http://iviltra.lt/images/files/37946689280.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/50863396792.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/87071278643.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f366f3a88---gawadasixurexuwap.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/86079676722.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/66027485198.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160746b3ca8a68---vetelonusasugifisu.pdfIn PDF document text
    • https://p99.tw/pro_pic/files/14868054721.pdfIn PDF document text
    • https://aashianarealty.com/file/47464079675.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608650cfcf47b---68489159130.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/74140456310.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1624983310_81bd7d9a19.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/kokerudunifosigimimolo.pdfIn PDF document text
    • http://cloverdiamond.com/file/jewud.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/96401186862.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16092803415bf4---zakavirejonenevexafapebok.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/e2556f242230c5a7fd1e8f94c1cfdb82/49599631479.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-8-31/20210831094337433220.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/57019359787.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_off0000e4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD00 17912 bytes
SHA-256: 24079c783ecac586ac00a425e8736004b7d113e30f31a4a045bcb2d268bfa702
font_02_sfnt_off00012b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B49 11224 bytes
SHA-256: fd8207981ce25a1a855a09d5b9e008db3e890bd77cf3fa84a9b42c44a56304b2

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