Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcab1ef1529f183c…

MALICIOUS

PDF

87.5 KB Created: 2021-06-29 06:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6fa9043937cd9d9a8721cb76569b8f6d SHA-1: a3283d5d67ca3a58932003f4d66062534c7c99d4 SHA-256: bcab1ef1529f183c55e968c3bfd2992e134cbd2e45966c78bfa65d595a506830
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080acf0ad0be---95261337141.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/b7769ca09a20cdc7020d5652c8577277/16789215124.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/f68e354ec18f2a565d93ab664c89a63f/77235132343.pdf
    • http://bigband-ulm.de/userfiles/files/xaramatumumovu.pdf
    • http://brlairport.com/images/file/lowurivazijoruzaxuluze.pdf
    • http://grawerlik.pl/userfiles/file/61939151596.pdf
    • http://brainbond.ro/userfiles/file/lofokosifaxozo.pdf
    • https://advantagelic.com/singhania/downloads/file/zudovinimesuvikuxagawe.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/614f442092e3331e3c3105851b5aebd4/83558254692.pdf
    • http://chinhsuasolieu.com/media/files/balolipesalobu.pdf
    • https://armagedonspedycja.pl/files/file/86287492057.pdf
    • http://wisdomtours.net/upload/file/metisujivunel.pdf
    • http://belhavenhighschoolalumni.com/clients/13962/File/gafisexiwofigosema.pdf
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/73812819819.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/8a6c0daa449570d4aa3d5feaea102679/vuvegefefomofunorep.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/qtbmei032a1r32j10o6s7jvdj0/wemeniveseke.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160c00eeee1b8c---fajujotuzi.pdf
    • http://softwarefactory.nl/images/file/26493391175.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607434d501e19---feramo.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/76bbebad4f893c3a095c268f428aa042/83637861925.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ogn5sb2mjqamfgv823d00fp2m3/24523170544.pdf
    • http://toyteepee.com/uploadfiles/file/210514141513306331o1deec.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70feb003a0---rekolojatamijedubufuzuxo.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/5a8af319a4413828035171e6e0f187bc/32071578963.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/51430881793.pdf
    • https://j-kowalewski.pl/uploads/userfiles/files/87239554794.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c667acc2e70---giwesifowonabeze.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=what+do+city+foxes+eat
    • 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_off0000f2f8.bin
388c1d654b1e71836e5f7978f017209973ccf6a65d9713e30664f34ccdf6b40d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F8 17408 bytes
font_01_sfnt_off00012066.bin
6658c710ee4a5cf452f40c6618fc9b3753caeb2af30aeea4261aaee145af21a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12066 10532 bytes
font_02_sfnt_off0001389b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1389B 16792 bytes