Malicious PDF — malware analysis report

Static analysis result for SHA-256 8347a5da8ee1c345…

MALICIOUS

PDF

109.3 KB Created: 2021-06-26 00:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 278ae09a8d36e5a8b64fe2edab27940a SHA-1: 1d23e4e50038e61282ea55b7360b7e4d5a10e15f SHA-256: 8347a5da8ee1c3450ba78c7b54b139434ce66fb8adfe872bbf5ee23773da7f0a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a pattern of using disposable hosting for link farms, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9813

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 https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/e9ceb06c7f851ce5d61682713790d995/xonevaleneve.pdf
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/15184975185.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/e0829b24ebec3b5b76ccd6fc70445169/99252055846.pdf
    • https://bancodevida.com/bancodevida/admin/images/image/file/47187944129.pdf
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/fetelomi.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1b77f2a8a---24718713779.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/eqmdvekslef8i9ob20httnjhg0/36048515806.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084939810a21---jigazaleg.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607386e262a99---84357471027.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/up9hio3i3sro3boju3u87du6u0/94981144514.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/ad302cd9dd176b0571bd7767956f6e6f/28548365548.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/2e726205ba1181f0b903d48e3ebc6a50/mudaforawemexemoxelokaxi.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a7f1dc36f---zepexux.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160771c15014d6---fuwemorukipiku.pdf
    • http://markone-tools.com/upload/files/rofelekovevifaxegujes.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f13b35f5e---20776316625.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/6157b79625ad5f4655b0966e450a2f66/pewabela.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/qgtgd5e7cn4vdl12tk0p1h30l8/xutajagemiwebafuwozemuwog.pdf
    • http://chickendaylacrescenta.com/uploads/files/98106113909.pdf
    • http://all-pass.com/folder/editor/file/pilufejulurav.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608601f4b5e3c---tukanuw.pdf
    • http://amuseonline.com/absite/userfiles/file/80769828496.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=go+dutch+meaning
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f043.bin
5dc6f2d32bfcc4c47edecc1c58ad6bf6461c3053a9f8524c8c21c2f44ef6b6b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF043 18552 bytes
font_01_sfnt_off00011f3d.bin
ed8678f2b6dbcf478cb9f1e65414c9529ab6adc5f80fc5f27bec305d86a0fc91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3D 20872 bytes
font_02_sfnt_off00015abb.bin
83877b5927df4353382ed94bb912296e0b479c5d8c3fe155f9822873b205da7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15ABB 17652 bytes
font_03_sfnt_off000175cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x175CB 16792 bytes
font_04_sfnt_off00018de2.bin
5b49c0968d20f601100fea146180972918e8d5d45cb4dd130ad72f7eb6204e3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18DE2 10640 bytes

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