Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e4c4afdf3d0ecf7…

MALICIOUS

PDF

89.8 KB Created: 2021-06-29 08:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd576def5334bdbeae404ce1018bfd1b SHA-1: 5e8b58b90a40faaf46507a6f91ab37990b6bcdff SHA-256: 7e4c4afdf3d0ecf7e1732b07dec195788cb574a2aad727901b2193f5653d49e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded URLs that point to various websites, many of which are hosted on compromised WordPress installations. The heuristic firings indicate that this PDF is designed as a link farm, likely to distribute phishing content or malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=shut+up+and+shoot+documentary+guide+pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099bc743aeaa---larejinipipomar.pdf
    • http://tischlerei-schlusche.de/sites/default/files/file/mupawazi.pdf
    • http://chromoink.com/updates/file/19355332825.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b520a092f---jomejukusosapubodarolad.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3218ca66c---vabonokokejunutobe.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a283ecb6acd---97081843165.pdf
    • http://metaglas.kr/userData/board/file/vigomipuj.pdf
    • http://dorp.pl/userfiles/files/55156071990.pdf
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/40353932894.pdf
    • http://sns.hu/_user/file/23759146801.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c40098c65df---xuwetijebusuza.pdf
    • http://bomtvplus.com/data/board/file/20210522115613.pdf
    • https://asiquim.com/ckfinder/userfiles/files/76021473913.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/0730ee46a81836123802cf40739f14c3/lutifigebizumali.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/ff3f996a085dc13099e5b184713faa5e/xonudoru.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/b1b5318131d0b0ea77060ff85b7c3cbd/fololegebasadazuxav.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b15b0595922---91900322853.pdf
    • http://quaint-house.com/dovubizerulamo.pdf
    • http://viprealestatebrokers.com/userfiles/files/65066800058.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085c240391ca---51282271895.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/d06dc11a40a43c76d08260c7e9d8ca8a/86063861076.pdf
    • http://merwepizza.com/upload/file/35176386159.pdf
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/21680523581.pdf
    • http://ytovietnam.net/ckfinder/userfiles/files/kugimuwugej.pdf
    • https://centrorevisionimonregalese.it/file/67151458315.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efad.bin
3faadb7ee5682811474a6f25a67d1e12f5140df67afa96d419d0f049e8a94997
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAD 11312 bytes
font_01_sfnt_off000109e5.bin
0f24970ad63e1d621f15dc7dff2898f4cea43efca2af90ce06906ff5fafd8266
pdf-font-stream PDF embedded font (sfnt) at offset 0x109E5 17944 bytes
font_02_sfnt_off00013931.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13931 16792 bytes
font_03_sfnt_off0001513e.bin
e3a1ca7fbcde87b6e2bc585668cff1a50452d2a09c95c546c16e9f90aebd6500
pdf-font-stream PDF embedded font (sfnt) at offset 0x1513E 1636 bytes