Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f3f977c7bd2bd8f…

MALICIOUS

PDF

83.1 KB Created: 2021-09-23 06:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b85e05f888dcd4867d1cb9dde6e0574 SHA-1: f098b6ebb5327ba8f40607b3e3eb6560d71bbd07 SHA-256: 9f3f977c7bd2bd8fa0fa92c32897ed8c2b54d28847444c10158973e7e2c9760a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, forming a link farm. The presence of embedded JavaScript and a high ML classifier score indicate malicious intent, likely to redirect users to phishing sites or download further malware. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=psychology+essentials+2+santrock+pdf
    • https://nezamirekhaseafoods.com/userfiles/file/suvekirodokogatimof.pdf
    • http://interroadholland.nl/userfiles/file/53988459625.pdf
    • http://elateridae.com/images/FCKeditor/file/32885386392.pdf
    • http://fabriziocar.it/userfiles/files/zigusav.pdf
    • http://ore-processing.ru/d/files/lirilanifonakotafipomez.pdf
    • http://ayhancevik.com/images_upload/files/83160361258.pdf
    • http://mos-craciun-inchiriere.ro/fckfiles/file/71849597581.pdf
    • https://www.naabelectric.com/userfiles/files/milumavavumi.pdf
    • http://phutungtdc.com/upload/files/zaluzirevomamolukekupagew.pdf
    • http://elitsatodorova.com/uploadfiles/file/weziradolifenivivosavi.pdf
    • http://zanethompson.com/userfiles/file/46874961845.pdf
    • http://konferencii.org/web/uploads/assets/file/66686734774.pdf
    • https://xenonsvjetla.com/files/rovasukoj.pdf
    • http://terralis.eu/catalogue_dynamique/file/vivinogosivi.pdf
    • http://w3-japan.com/js/upload/files/33428089795.pdf
    • https://textmakareknutsson.se/upload/image/xavofe.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613689d82eeb7---dapuliremijifutukusefon.pdf
    • http://fantasymusic.it/userfiles/files/32842329570.pdf
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/rukobivumofulojelowodole.pdf
    • http://bezagsecurity.cz/userfiles/48318209805.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0cbe09ee1---94837685464.pdf
    • http://lideparts.com/userfiles/file/1631031184.pdf
    • http://live-net.it/file/39311638632.pdf
    • http://www.supair-lux.hu/ckfinder/userfiles/files/fupikesilakaropeko.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16136317453aec---47766948808.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc5c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5C 16792 bytes
font_01_sfnt_off0000f473.bin
57ec3699327fcf54bd9748afdb9810f3417ba54b49a811fa919cb287f56671f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF473 11224 bytes
font_02_sfnt_off00010e9f.bin
d85db57124e7cbe805e13e571698795364bcb99a3c3571016ca6efc534639959		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9F 18132 bytes

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