Malicious PDF — malware analysis report

Static analysis result for SHA-256 e79bf17d1e1a7704…

MALICIOUS

PDF

74.3 KB Created: 2021-09-04 05:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 4db7fb2dfcc968271e3806bdb044f2e0 SHA-1: a81de2c3d46b47bd099a23ca26b6416e8068c261 SHA-256: e79bf17d1e1a7704eb9041bbde860f2b8360f04d702af2bd434e5b571b10ef95
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an intent to redirect users to malicious content. The presence of external URIs and the nature of the heuristics indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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=role+of+teacher+in+moral+education+pdf PDF link annotation
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2002e59d9c---17390458816.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/50197388041.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/vubadivasojisorusato.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/furagokoserakoruzaxomob.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/e752f5a4a96ded4508a82c8415ad6838/30209544815.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0f229c20d---81317321344.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/615f60d185dba6dd4f08b478039edea5/mazikurumubokinev.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/lipazokipimax.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/40440517628.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/1h4mh9rde16l15gj209cg2qvmt/zejobatori.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/6a0bimosc1o5sv6o15isp3ld4d/tuzimaxabizakiwotekud.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/bagegezuf.pdfIn PDF document text
    • https://xigmatek.com/upload/files/39845593070.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/memidapemopapizuneloni.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/1ad2f742d28d539c4e1714b8023e6441/merinulamos.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf4185aaff---pobaruxexalamelof.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4d432d796---saxegifimivagizafamadixa.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/72682237208.pdfIn PDF document text
    • https://taperagi.com/contents//files/waxonagu.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/notexotojojeposajo.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/48860798068.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_off0000c07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC07C 10864 bytes
SHA-256: 64e206a28305ab786b8bc138f88ccc16f0ba7318b6a6f8e2452b360ce20cdc6e
font_01_sfnt_off0000d95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16C 16360 bytes
SHA-256: 9ebc99966387110e950c932bee7d0f21ff8ebd9dd1418e5f35b4c6bab500c7df

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