Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f3e51559596fd76…

MALICIOUS

PDF

97.0 KB Created: 2021-08-31 23:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: deedbb673ad9b79e40da66a1c74549bb SHA-1: df0c3c386906e1e18c8c387d0e821a369b5e8037 SHA-256: 1f3e51559596fd768fa366034f3db15cb04b3778ac7c31249369026823457d65
200 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content. Heuristics indicate a link farm and a call-to-action button lure, combined with urgency language, pointing towards a phishing or scam campaign. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 10

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=rrb+ntpc+government+recruitment+exam
    • http://esistore.lu/userfiles/file/juterolemiwena.pdf
    • http://goteneplast.se/files/images/file/pimijudoraj.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/2vrmot5r0v1kivr47ftln0f7c6/kuroluwupuvoraban.pdf
    • http://dspec-car.com/js/upload/files/bojoxumemafodar.pdf
    • http://dok-vo.ru/userfiles/file/63857894659.pdf
    • https://hrmconsulting.biz/upload/files/38220939919.pdf
    • https://datajournonepal.org/files/ruveriragezunelinad.pdf
    • https://bdcomunicazione.it/file/73771532102.pdf
    • https://carrieres-pierre.com/userfiles/file/tinidimebevul.pdf
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/88246620810.pdf
    • http://kagoshimakojintaxi.com/userfiles/file/4476293428.pdf
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/c091e34dee8db14c5cd033e5ce9eb2fa/63934272917.pdf
    • http://daindnc.com/fckeditor/userfiles/file/zanubirewer.pdf
    • http://alemotta.com/resources/original/file/86812221248.pdf
    • http://everest-c.ru/ckfinder/userfiles/files/morivesitogusotifesozux.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/412c1f7a90d35c9b7714e651e843f7eb/78962942922.pdf
    • https://fotokeramika.bg/userfiles/file/36042976745.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cfd216ca4---43268934874.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9ad952db---puzipikijadararusas.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d582ffb384e---xobirameru.pdf
    • https://jahanchart.ir/data/files/file/jexevujitutulazunod.pdf
    • http://highendschmiede.de/highendfiles/file/mesimafuwapodumib.pdf
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/felunenepibenero.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_off00011388.bin
ee80cc055e05c7bd30288d6dfe1db8e951b7348e52ca436baa6410b91f82820d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11388 18936 bytes
font_01_sfnt_off000144a6.bin
14b38beb4a90f69ba14b9760df20b96f8f3c8f4d041139ba0365a50cc96a42a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x144A6 10956 bytes
font_02_sfnt_off00015dec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15DEC 16792 bytes

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