Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a3e15dbd5a3f02c…

MALICIOUS

PDF

94.9 KB Created: 2021-07-18 00:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bb43433613a2fdbbec1c1bd6f4a2b846 SHA-1: a6f403dcd6ae8828b5c1989c89631af9e84604ed SHA-256: 4a3e15dbd5a3f02c32b190668a91593039a38a311657e6aca9bc0c7d30975391
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. These links likely serve as a link farm to distribute malicious content or phish users. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', further indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a694e73cb96---66214236558.pdf In PDF document text
    • http://pokewaveanaheim.com/uploads/files/5911801693.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/rocbaf7mfke38rgbf9ue074vc6/pitutipufekoxuwaxuw.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/repavenarepowiruburavimer.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/ckmek9mr0463sd3h8g4513udsi/39888777153.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/pakumuwifobe.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/jibexojekof.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ik13cgqru6hi459dind4emc5q1/lutovarijububapewefibu.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/36753452545.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/a12376b5bb8d8a11a8ed8d28b89e210a/xekenakezi.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/rujirajime.pdfIn PDF document text
    • http://ahchala.com/img/file/zewagofefebovegunubufotif.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/jiroforatawi.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160acf16e955a7---xanudaxefimedapapuvome.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/10204429073.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a79107197a9---14177013930.pdfIn PDF document text
    • http://teerosy.com/ipp/images/uploads/files/78954553616.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fca978d08---55500590566.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f687dd21e8---kujokikex.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/79799334429.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/wubajuj.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f519e4b298---67328812366.pdfIn PDF document text
    • https://mimpishio2bet.net/contents//files/vuwowapazafeto.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/gosixodobuzulidokemava.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/61487941923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=set+for+life+game+rulesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBE 10628 bytes
SHA-256: 5cec2ff763f8d6c2f3a7e28b50c0074a8048dcbc7b634a78cf014f0372d86b60
font_01_sfnt_off00012812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12812 17816 bytes
SHA-256: f055c294a13fc6def0428e41fe1841f8374c6688bb5804287079542b17f3d180
font_02_sfnt_off00015678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15678 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1