Malicious PDF — malware analysis report

Static analysis result for SHA-256 d172d509a30a3666…

MALICIOUS

PDF

98.2 KB Created: 2021-07-03 14:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 379ac8574082fd0f3ff3501eb9e257f4 SHA-1: 1855a1d9d45886d7dc7fa38cbd4f4fd70fce8dd4 SHA-256: d172d509a30a36668d29805cc05db88d487ed79c692044bc50a86b0f0012d2e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to act as a link farm, potentially for SEO manipulation or to host malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://drafthe.ru/uplcv?utm_term=best+places+to+see+in+coorg PDF link annotation
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/9c620c9c97b9c47450a92289949e8896/15602793033.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/98532336291.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/64126161646.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608af95f6ac19---10149634338.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8fff5b24a---56808623313.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/32265151323.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/wipifamivixunedesa.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/426521cef0c0de6acb4726eb302c253c/pejijazuwow.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/76889108721.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5162125d2f---fopag.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0efefa1657---6280756578.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1c91df772---10541977401.pdfIn PDF document text
    • http://celiapopememorial.com/clients/4/45/45605e685ba8a3b32f56966823665796/File/rebokodilozatiparez.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/lenutakegonap.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/kuvipixidedipekunibi.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/6595654720.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160969a01a96f1---gevotere.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/wimejiravurevitejulizam.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/dorajixarurogowexe.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/81500519996.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c46a3db5db0---nivaxabuzetulabe.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608996e107435---takukudid.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_off00012079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12079 10600 bytes
SHA-256: 6c4b7d6e1b2b63473c91915169728b58fc5611ac5947edc237944b04a0ba606d
font_01_sfnt_off000138da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000150ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150EC 16528 bytes
SHA-256: 247d6c66d5d3195c2706dab6cb2d80faedadf949813e72bf204205ac4cc720d4

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