Malicious PDF — malware analysis report

Static analysis result for SHA-256 5606d37670cb01b2…

MALICIOUS

PDF

86.0 KB Created: 2021-06-28 13:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 700ddb559bb8f74ca417fda2545cb2ca SHA-1: c894ca7b5cdcb0d57112265a45ca8b36c8ce59e4 SHA-256: 5606d37670cb01b28509607f5535a2e41b7255586bb05ddd2265b442a57e5586
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://coretry.ru/uplcv?utm_term=how+to+get+mr+game+and+watch+in+smash+ultimate
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/xikasuvonorilafolawalimot.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/woberezuxozudiwoji.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8c7477f1b---gamepaseribikaxaga.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/31a1fdf6d6e40c5ad5cbb4c2047cb83f/zetunazosiku.pdf
    • https://foodvellythailand.com/upload/files/31913030836.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073305bd9672---kadoratasefim.pdf
    • http://goldway.jp/upload/board/file/nedalopezozozer.pdf
    • http://hakkabrothers.com/userfiles/file///ririmexison.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c74d9f3cdc---22688854530.pdf
    • http://etpatatietpatata.com/userfiles/files/dafanurajezojerapuwomifa.pdf
    • http://toshiteriyakiburien.com/uploads/files/40057702368.pdf
    • https://vmwarts.com/ecovic/file/44948172685.pdf
    • http://archinfo.ru/uploads/file/90680443521.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607edeb779df7---93053323942.pdf
    • https://ahreco.com/uploads/news_file/xeniza.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/9r3eclu0n3mai3hc62jftae1id/56061787112.pdf
    • https://ibeguiristain.com/userfiles/files/luvukekuzinavav.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/8403052b0f7d1b0494820f988a09252b/zikiwumanuzux.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b610e241849---libat.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/5qmditfajnjpsoik4hr4ccnfob/kapiniwojew.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a805f34912---rusazaxife.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6aef090775---nisoremafigapugowizokupo.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/cet5j36n4ja98tf73aimbdf62v/xixazuwuderove.pdf
    • http://magendans.com/imagefiles/file/77963518978.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4f77aeb4b---83343856185.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_off0000ecb5.bin
421eeb8416a2e43b787f78a582f3b1bb77c5fc80f32a8f0ae12934202a955dea
pdf-font-stream PDF embedded font (sfnt) at offset 0xECB5 17056 bytes
font_01_sfnt_off0001192e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1192E 16792 bytes
font_02_sfnt_off00013145.bin
b77506d85528629ee3ffe062bcb2f374645eb9658e5bb92e5ed48c41e37c1819
pdf-font-stream PDF embedded font (sfnt) at offset 0x13145 10992 bytes