Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd310ca2ad60f452…

MALICIOUS

PDF

82.1 KB Created: 2021-08-19 21:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ee32a7ff0c0ca02d4c4d0fe42247f5ce SHA-1: 325ca974426607b893f049be274478dd437db6fb SHA-256: dd310ca2ad60f45236d0b7889240c7dc5302e4016c4a671583ff237b8d5fbe5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting an attempt to leverage SEO or compromised infrastructure for malicious distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://archism.ru/uplcv?utm_term=sumas+restas+multiplicaciones+y+divisiones+para+cuarto+grado PDF link annotation
    • http://gojjang.com/uploads/files/65590001599.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/fusagabovage.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/27113876065.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cf4fc7ecf61---favopajab.pdfIn PDF document text
    • http://school15-tyumen.ru/f/23071145428.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/72373516619.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/73748987325.pdfIn PDF document text
    • https://invest.pl/userfiles/file/xazuboletarujibi.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/93568337862.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b82f180232---wapinit.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/fa56cc2f5f4ea015fc9a251918bffa0c/lokux.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ecs4rfqjm4uoc1ngsj9ta2o1d0/46512638870.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607142e75cbba---23774401940.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/moforodefukuze.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/1dbbf88368d2645ceb365764d5c96bf7/98489700595.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/jogagasadefiwa.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/fofitimoladisuritep.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/jujixazegokofej.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ba252f1ef0f0d884ce583b29d278ed37/nikezudavoxi.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/piseguborufep.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/xitifiwo.pdfIn PDF document text
    • http://garderoba.sk/images/_file/sidumisanuruduj.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/8402626554.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_off0000db98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB98 17284 bytes
SHA-256: 2b8ed384c96729d745f0cd4b3854c7f7d0975189b8c6ac7eb883a4cf4f7033e8
font_01_sfnt_off0001078c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078C 11212 bytes
SHA-256: 4c3e5b760b86ec425743d12487430bf94a255cdf39913a35e6aa6875ac41b3b3
font_02_sfnt_off0001219d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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