Malicious PDF — malware analysis report

Static analysis result for SHA-256 1394d54ff88ac5b5…

MALICIOUS

PDF

92.5 KB Created: 2021-08-01 00:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 12395df70d25639966f088961180f479 SHA-1: f3753579abc0629dbe4c28af37abedeac72ea18c SHA-256: 1394d54ff88ac5b5110d4944ecd7f734b6e3b3f2235a26198b48487bfa95d040
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of an advance-fee scam. It contains numerous links, including one pointing to 'synerhu.ru', likely intended to redirect users to malicious content or phishing pages. The document's structure and embedded links suggest it's designed to trick users into clicking through to a fraudulent service.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://synerhu.ru/uplcv?utm_term=hsbc+wire+transfer+form+pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160e0a3df675fd---79332204411.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/fl6i83biprf5qura022u4t0mo6/89367397159.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/c62ad4d167865c8b0b16a069f518282a/70923543420.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3409e6b91---kubaxulowuvutuwenijima.pdf
    • http://niszczeniewaw.pl/userfiles/file/85578414143.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/fdd0f8c7befe8b07337911e8d325192c/72305823146.pdf
    • http://highlandcougars83.com/clients/2/26/268573c5102cd00412bac87cee9346ec/File/xazebuxonujit.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/h44kloif542qevk090ltqk0d68/39282750531.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f97cabab92---lexegunavugub.pdf
    • http://studiosiciliani.eu/userfiles/files/62872362233.pdf
    • http://dinskayarealty.ru/media/file/84787969905.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/fb857a2c057376b77a3a1ee01e727536/51744046872.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7961d1bbff---61049616992.pdf
    • http://bulgankhangai.mn/userfiles/files/sokisasizoduwipiped.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784d8c47725---15688720699.pdf
    • https://eletvital.hu/uploads/files/wojimegetuzutujevagesox.pdf
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210620054604.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ed3106f79---wokatulotedawenuxefiwi.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16070312080a95---79825224186.pdf
    • https://ilexgold.com/app/webroot/files/userfiles/files/4580305051.pdf
    • http://stacjaregeneracja.pl/userfiles/file/fiduvuwodelenanojewotal.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b14cc4accf---49996498100.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_off0001055b.bin
c464142fc1e2f9379bc517c6120f58cae5b6c4008a1e2ac99d50152f5856a9db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1055B 17212 bytes
font_01_sfnt_off0001329b.bin
5fd38c03ef5a0a8af5932c141e7843e6809414909707773e1430640e3cf2e60a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1329B 10952 bytes
font_02_sfnt_off00014bda.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14BDA 16792 bytes

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