Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb03c09ce5b0c15…

MALICIOUS

PDF

82.0 KB Created: 2021-09-05 22:30:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f341010fbb06aa8f00d166a4f26cb435 SHA-1: a9891964830d689ae006dabb80b99c8957b4d424 SHA-256: cdb03c09ce5b0c158b5246313317b64dae0b5d1386b8aaca0f900b7044ea624d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, likely intended to host and distribute a secondary payload. The presence of these links suggests an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdc797b8db---jelamegadipewan.pdf In PDF document text
    • https://hiperaktivite.info/userfiles/files/49169894169.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/39776220266.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/5695962907.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/jufoniwodisopebalize.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160dbee15d01eb---17876787832.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/bopomenofidisesupewuk.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/c2e62c6b81913e52eeb8d0c7ddfdc9a5/lifokuwonisexonifuk.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609912345cb2e---59910184450.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/45481049816.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/62575893655.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608df47310f3c---94594025068.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/5f58d1b428a0909b24c122087422a065/69872857768.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cab98780045---75247900413.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/21711611876.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/jomiravorowobe.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/detula.pdfIn PDF document text
    • http://sooclose.eu/upload/File/volosudexid.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/44aaab9eccc33045ee121526664311aa/80099058595.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/97620555235.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/340cd6e742f96ef1013ddcddacbcf85a/94493170089.pdfIn PDF document text
    • http://riph.pl/userfiles/file/moxokilanabefimixepabumik.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efc817b739---79130184684.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=worksheet+hand+lettering+tombowPDF 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_off0000d9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AA 18392 bytes
SHA-256: e2700a2c3fd99920f96555d0221a2f71468f47d5673a8a721b234cf82902e959
font_01_sfnt_off0001098b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A2 11004 bytes
SHA-256: d144a2d47bcaf36c709c6614bb97dc0187983ba40704fba6e642a78408800959