Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5ea9d005d4fcd81…

MALICIOUS

PDF

81.6 KB Created: 2021-06-25 13:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0cf487ab09dcc35e923e7782c266afe6 SHA-1: aa45c4b62110da5d91715b92cda4ba11364696a0 SHA-256: d5ea9d005d4fcd819b35878acbc252d4d50b9315dd826c58f78772f6249dbafc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute further malicious content. The presence of multiple external URIs and the nature of the hosting (compromised CMS uploads) indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/jolirusutusuvagubokujim.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/07r4usforr6ppq7c0r1reqk4t7/35085978822.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/a59bab8c8a87b241401597722c46dbd7/60605178405.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ad13b3861---15486525927.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160798a6c58abe---bipese.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a662bd30ca7---83745537800.pdf
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/29549212453.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608582c92fc7f---lesoxodupisapowuxasifomuz.pdf
    • http://cesmclassof68cheyennewy.com/clients/82478/File/86488047266.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/631455608b46030f20d88382194ac345/67666932064.pdf
    • http://aylincinarli.com/fckfiles/file/tetawakewimowo.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/tvhnl19obnkeuauocg7vdblup2/51639994395.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fde39ba43c---20852091936.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/12284251ae99799edd9bb6e3f0297514/tafamax.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=shivlal+higher+secondary+accountancy+solutions+pdf
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/0657484cee0aedca0b43949a49a1d787/12566570950.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_off0000da92.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA92 16792 bytes
font_01_sfnt_off0000f2a9.bin
feee5d247bbdbac3113027fc347ac2dc4ca8bed7a14077d33cc586b10c96ca6e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A9 11252 bytes
font_02_sfnt_off00010cd1.bin
b299e61be22819dce0488e69a6e9d5eb9f985217a0e431c85bf41c1f87812c0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD1 17136 bytes