Malicious PDF — malware analysis report

Static analysis result for SHA-256 e16c935c988adfed…

MALICIOUS

PDF

80.6 KB Created: 2021-09-09 05:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 98178d72ede676603e29274e48a7c094 SHA-1: a310d71e76f67a47448cd0cc5823b9dd81e93d47 SHA-256: e16c935c988adfedf64e1472d5a8abe35b3e17f6f10954002dff0d0637ab47b8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which are compromised or use disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the structure and URL patterns are consistent with a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/gomopazuridowugaxagaj.pdf In PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/f4d5e6b0bb8e0805f78e72dcf2c74964/60931890350.pdfIn PDF document text
    • https://mihalex.by/files/files/tosakenufeme.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/13197081886.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/tazepitusire.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135875693d2e---lokolalewapak.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/43719399375.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109080735118655.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/muzefu.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/10375874748.pdfIn PDF document text
    • https://laser123.com/geektic/files/fizex.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/10242990305.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/27a30b66e85a5956a11bb8347e91e557/tezefomaxo.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376b0667adf---mivexedopalijex.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/60476154007.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/kivujeriwivavawifare.pdfIn PDF document text
    • https://kaparatt.com/images/File/22783393030.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/73193371766.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/74703486151.pdfIn PDF document text
    • http://theponghop.com/upload/files/80455975335.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/55750823857.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/dakewisix.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/b0ffo0qf9npbjr0qkflr3d68uv/51100937810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=gba+emulator+pc+pokemonPDF link annotation
    • 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_off0000d68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68C 10648 bytes
SHA-256: 6b4e0a65f6155bd34e6496fb5657544b380423dcacf015101babae2cf63578f0
font_01_sfnt_off0000eeb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB7 17816 bytes
SHA-256: f1dab921c8efe21878550b0b74b750d1ec73b531c3cdd292281511bc0a0fe315
font_02_sfnt_off00011ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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