Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcdc33cd0b5104e2…

MALICIOUS

PDF

83.7 KB Created: 2021-07-12 17:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa332ef95064903de757481f1a5b5a84 SHA-1: e51795603dda81eb90daf84bfe28b46240fa9610 SHA-256: bcdc33cd0b5104e2ceef17bd93b63dcfdbaa0d4681c15eb5b5b51a4209291568
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'SE_URGENCY_LURE' heuristic indicates the document may use urgent language to prompt user interaction. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=mitral+valve+issues
    • http://prttour.ca/FileData/ckfinder/files/20210616_B58D2AD905775575.pdf
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/b7d516dc42e55f4962da2338f29c6f30/42233830975.pdf
    • http://nedirajtebosnu.net/userfiles/file/fotudazemamebeborinose.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/cc4a4a9bce78fdd02cdc038ad546c9d8/tidabakufoxaka.pdf
    • http://sam-global.info/files/file/82640546178.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/310433e07225abd189af6ca728583a8d/gosawage.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/hffn9amce4oovmhtq00nejqsen/73227317228.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/3c59d582ffa985afbc50443babe0b1fc/porelal.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/fb7e981dee21c70eca1320b0c2e3d809/2439628180.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160914cf6377eb---23933409150.pdf
    • http://nsk-nalogov.net/upload/files/duvixebotefozosudola.pdf
    • http://1-cx.com/ckfinder/userfiles/files/41796848827.pdf
    • http://integrotech.com/zdjecia/file/sexodazomedojunena.pdf
    • https://mariellatriolo.it/public/file/58863615392.pdf
    • http://universalestetic.com/userfiles/file/36216773964.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/58vi5g3oarqkg9ch5fb280lpis/fubip.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/83c614c843bf7dd6f8eb01269eecc2ca/dejisedakazabobibadolipo.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/0fded831ded33cf9a3b6aa896e119bf4/xozizarawuves.pdf
    • http://moonlightmontessori.com/upload/files/60827680888.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf2773cff1---96125709107.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a29ad3e10c1---90980946036.pdf
    • http://deccanquest.com/konadnew/userfiles/file/51436208236.pdf
    • http://e1pl2.nazwa.pl/busy/fotki/file/fomebemopazexapotesitup.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_off0000e889.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE889 16792 bytes
font_01_sfnt_off000100a0.bin
8b5eba99499af0cc513355c2ac202a88efd35970830d81cf0196860b0ea7dff5
pdf-font-stream PDF embedded font (sfnt) at offset 0x100A0 10036 bytes
font_02_sfnt_off00011719.bin
a965feb7de4054280aec954310f5273dca925e947b29507f014843a628e6242b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11719 16576 bytes