Malicious PDF — malware analysis report

Static analysis result for SHA-256 1759c435acac184c…

MALICIOUS

PDF

74.7 KB Created: 2021-07-20 15:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 808ded860250557c109168c978de4669 SHA-1: dc92a46d1f156a6cbd5f407d6a735ced10dc2bda SHA-256: 1759c435acac184c8c6a285b5626ab72086eab02276c7597de63e7f693892322
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, likely intended to lure users into downloading further malicious content. ClamAV detection and ML classification strongly indicate malicious intent, specifically a phishing or trojan distribution campaign. The document body is unreadable due to encoding issues, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96ab43d8d4---jadifova.pdf In PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/0860b82d385078b48d835bbddb20ef93/babowanefabe.pdfIn PDF document text
    • https://slide-bearing.com/d/files/zubifufipabedololen.pdfIn PDF document text
    • http://servmed.net/userfiles/file/pemujorebogedetoni.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/1c981d60b88c2b303c2fa39dcb8209f8/27083188693.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebb2580feb---51253849974.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/ced9meb78m3ql9unnrmr50m8ja/tofujepigid.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/666d249c4476033010933f70897809db/47010523298.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/54396840692.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9afbe2dd7---2325958549.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607baead73033---35304388124.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/8f63e9b818fd3bd0780f9543e3238b6b/58773438152.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/fukajatuj.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/10255963051.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-6-23/20210623192427452730.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160780e3b4c403---94054163115.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1606f380d65759---46118301242.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/34873240092.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/1tjag3g9498cc9hvee5uuaa051/jufegadebuxedekigofakax.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/28a8334c4cad27a974ed0cd1922718fb/nigizozokimexokaguzun.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1f2048801---vobitidatavoboped.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9477e30a6---webozire.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/19615751567.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=hardware+components+of+cpuPDF 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_off0000c39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC39E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB0 15944 bytes
SHA-256: 490d0d4dd359cf912f03757d8265e15475df1c86650f64085e83af0e5ead1fe6
font_02_sfnt_off000104e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E8 10820 bytes
SHA-256: d15c108a56daa4ad7979e9f730921f996cc4fdbeea29eadecf693857d59e2ab8

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