Malicious PDF — malware analysis report

Static analysis result for SHA-256 3612e76ce3efc97a…

MALICIOUS

PDF

79.7 KB Created: 2021-07-04 06:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e27c505ba65a91f0adf74d08ff5b1a25 SHA-1: 0563c98cf37dfde016de8f11e5b22fd94be9ac49 SHA-256: 3612e76ce3efc97abe142ce0de289f950c9398d22cd4043f6090dc9358fda571
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised websites and disposable hosting, likely to lure users to phishing or malware sites. No scripts were extracted, but the presence of many external links suggests a primary function of redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://medvor.ru/uplcv?utm_term=network+management+principles+and+practice+by+mani+subramanian+pdf
    • http://arohitourandtravels.com/userfiles/file/54952111173.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944e86454f5---bapawalakifunubezoliso.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b24bdbda1---pamodekeluzumuvejipe.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bf81e21693d---29840228283.pdf
    • https://abofahed.com/userfiles/file/41324043882.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ac239634ded---18995270588.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/54bc06ed17714c03890f2adfbca65e60/mowutubomesinoxap.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/1oe5q78qls0cujrndcl23ccpn2/tugenuwefilawaxezuj.pdf
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/23076662673.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fed4d5c47e---89519015268.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/10318562476.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763f664d86b---wolunevalikavozuti.pdf
    • http://kdwatch.net/upload/files/2021070408452897.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c009630ffa4---kixekaxemoxitulax.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/17530862425.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/6cvok9u8g0gdoocusda9vhcrt5/lerisonuzotuxepizaju.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1609da3c809db4---tupotevabaxotavuma.pdf
    • http://ownlines.com/upfiles/file/padomazisukumitisigebuxav.pdf
    • http://mwflower.com/upimagesfile///xifetilixirose.pdf
    • https://emilline.dk/ckfinder/userfiles/files/ratuvidepadosi.pdf
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/pejoruri.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607364ed59cb8---niwitasobika.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/cefdd8df9a016baa10bc4511fb233062/godatedasaloxezetute.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609d908a0b578---dilajisikaga.pdf
    • http://kapelski.pl/userfiles/file/78547605137.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735fe5566ed---905290474.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_off0000d075.bin
704ea61dc2fc9bc5bb3189e9221113105f8d8cb525c9d250bdee10e6e87f5240
pdf-font-stream PDF embedded font (sfnt) at offset 0xD075 17548 bytes
font_01_sfnt_off0000fdb9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB9 16792 bytes
font_02_sfnt_off000115d0.bin
6d30948a1f6fde88f371b57c4283cde9abc6358c3c2251009d2a1b6fa0778306
pdf-font-stream PDF embedded font (sfnt) at offset 0x115D0 11472 bytes