Malicious PDF — malware analysis report

Static analysis result for SHA-256 49c9bc0834b54d2d…

MALICIOUS

PDF

75.6 KB Created: 2021-07-10 00:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a53f5afb019a7ff593b19e8e721fe09d SHA-1: a8d075f4b378ded8fbaa51a259591908c2d2ed07 SHA-256: 49c9bc0834b54d2dbc060351f04f5b8ff86de8c90efacc7c82637578796bae2f
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. These links likely serve as a lure for phishing or to download further malicious content.

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://pistant.ru/uplcv?utm_term=chi+square+practice+problems+with+answers
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16075c25f9f101---kawijazezubufatazaxep.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/b815840e4e7497ad760f0b9cf7cd57d5/84268690258.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a65ec6f010f---91577223662.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/b5ca218842d123222629214533518e9d/89733476858.pdf
    • http://446888.top/userfiles/file/pimunasekeji.pdf
    • http://mhinflatable.com/upload/file/sazusafanakebekapuden.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16072103b7c3e3---68748283585.pdf
    • http://bagiez.com/userfiles/file/98045076805.pdf
    • http://bjjiffy.com/upload/xitakowe.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888ecb5e8e0---duzosanova.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a043dc0ffec---nakepe.pdf
    • https://pottoka.info/files/galeria/files/fagejomekemivenuketino.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4cbe542d2e---43770011154.pdf
    • http://simonide.org/userfiles/file/14123625668.pdf
    • http://www.awakohchang.com/image/upload/File/oriluduz.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1056ce998b---67955975017.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dca2d1a6a6b---12486055465.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/auua1csfafambmfja6h4or8rur/42809001457.pdf
    • http://suacuacuonthanhhoa.com/upload/files/19077177303.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16082c78351600---fusevarito.pdf
    • https://teamcode.net/upload/files/29262965335.pdf
    • http://www.climatisur.com/ckfinder/userfiles/files/bexusirudepat.pdf
    • http://446888.top/userfiles/file/valis.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_off0000c11c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC11C 16792 bytes
font_01_sfnt_off0000d92e.bin
49003f2a5927997bd524994f7e87983cf96a24bc968dc7635af1349b6b111fcf
pdf-font-stream PDF embedded font (sfnt) at offset 0xD92E 17504 bytes
font_02_sfnt_off00010774.bin
d90a3f4a4e5456bc252518ecc8a5b416924f02d81a26f994facef3cb381f9acb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10774 11144 bytes