Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb08beb1b66a1ab…

MALICIOUS

PDF

107.4 KB Created: 2021-07-13 13:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4ffabcbb9696fe3f821d843e460f4460 SHA-1: c3bbe6b4becb8e1b8bfc77d11973c505d2060d67 SHA-256: 7bb08beb1b66a1ab8e67b925436da2277fdf7705559ddf324a20a2b95b052bf1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised CMS upload directories, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing campaign designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://coretry.ru/uplcv?utm_term=investigating+bacterial+growth+virtual+lab PDF link annotation
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e67774007a---memufovumax.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/37695035603.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/zowimopasopowajazizoduzo.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/673c4ded1a24f44d5fd6030748f33678/samasalidiza.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/gosizi.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/vuselumunuleriga.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160732d181f574---vebogukerokusisej.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/topevojatubibokoti.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/7d41db697319bc413d300fc08059fe75/74403036502.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/9bed8776d3e1a7ac05f762e628fefcde/nelelowojegonizenikalaf.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/voluvesobid.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/kowafubenanivixizazi.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/xulor.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/3532606952.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/67622372ba1923fc0c7fde189f7db342/bipotokasezaxir.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/71224282387.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/52736316325.pdfIn PDF document text
    • https://heider.ru/wp-content/plugins/super-forms/uploads/php/files/6840683b468c0cf159333a79ee212015/walulubomamixafozubo.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/tabumupu.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16084a58e8cddc---domadopibarogigulumumi.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/79084395293.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/24533758858.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609654f671fae---takemivolizupoxasi.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_off00013e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E6D 18296 bytes
SHA-256: 1280882495d5d425db2e559132f48b8139c4fa91712bb7f71e6e8a1b1f2315de
font_01_sfnt_off00016ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000186db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186DB 10852 bytes
SHA-256: 67bb17462e7e9fe4a0255b67a8d431aed0152ecba7234aeb2aa43e95999ef6a9

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