Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3cd052a0807e210…

MALICIOUS

PDF

93.1 KB Created: 2021-07-06 12:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9301d32e86ec96201239bc16c7841d2a SHA-1: 8df5b0bafe57b4747459dc49aaef3a565bf105bb SHA-256: d3cd052a0807e210c580af3101f678a04d2bd89efa6509a75a8d640d09abe456
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure that attempts to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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.
  • 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://krisoc.ru/uplcv?utm_term=cv+template+word+for+civil+engineer+free+download
    • http://moristas.com/userfiles/files/72306981542.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/1dccd269e85fb859897a15316fea3f13/68883716732.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/lkbd4qd5htiiqre583eeau6165/9643714192.pdf
    • http://asja-doll.ru/userfiles/file/18920392695.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/e2d27eedd04ce8d98b928ffc2e926ea2/88829112885.pdf
    • http://xedaptap.net/userfiles/file/59428057883.pdf
    • http://bertrandetgastineaudesigners.com/userfiles/file/77143434004.pdf
    • http://nousgarage.com/userfiles/file/wewunufaberebokemamixamej.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b60a835afa2e98d6d9e74f96ac5493ad/bilijisipudimikali.pdf
    • http://waelfawzy.com/userfiles/file/gozanadexewagegududa.pdf
    • http://bahtiyardishekimi.com/fckfiles/file/kukusikozevuza.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9a1e753f6---95515581973.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/ea07371343070019aac69ddd3cf05a1f/44700548801.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ac7f2c016---36317475218.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/61963194d69c9911cfd70b73b926aa27/95613907383.pdf
    • https://htchninc.com/d/files/69580816965.pdf
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/b4hom14kkv05ue68qthqgnin34/57803409167.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/9102ffbb13301ae607bceab229bb4e61/vowuluzejorabetelut.pdf
    • http://stepsforstarlight.ca/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/zeronapepimiposiviju.pdf
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/kdm2r9vnbmnh2uku7hojha188b/gaxalesokore.pdf
    • http://fedoro.ru/upload/file/28979269497.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d3c4303a4---53553776974.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9942084b17---29767266082.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16094732e6f6ab---jifenelobubobakumoda.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_off0001095a.bin
9438a2180eb3ba701db260ce07459a1c5d3ee0809bd77259bed5233d1d24b44c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1095A 16980 bytes
font_01_sfnt_off0001354d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1354D 16792 bytes
font_02_sfnt_off00014d64.bin
9949dcb9c6492a6d0db97d1ec3fce1dfd2610def8490c236fb87166d4e768298
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D64 10976 bytes