Malicious PDF — malware analysis report

Static analysis result for SHA-256 a080adbe30cdaf27…

MALICIOUS

PDF

86.3 KB Created: 2021-06-28 12:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6f16072b3a33e748f675c86d52b5d72a SHA-1: 71f3bb253ed12d05992635de2251ac3a33375c52 SHA-256: a080adbe30cdaf2787b6b8a57cf244632349877ac348dfa63987cf421da0f730
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF contains numerous links pointing to compromised WordPress sites, specifically within the 'formcraft' plugin's upload directory. This suggests the document is part of a link farm designed to redirect users to malicious content hosted on these compromised platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160944ef2ae95f---xasewusu.pdf
    • https://monographie.com/ckfinder/userfiles/files/62302591257.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607700485dae3---rimorodupu.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b398e57ceba---noxuxejelopu.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/rd8cd59q5jv9cr5tcokh42454q/vovesixidimevod.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b567a8493f4---49915249843.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160796084b741e---24172048886.pdf
    • https://all-stage-meditation.tw/uploads/files/60bd5d50c9074.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/6ihm7t9ktghraa7tqtproc30n0/29080522710.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/isn5ld6fap93g639ffhdvv8rcu/92387363933.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c00413780---jotoze.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/e7c9d8b458d7aeb5be317da1e4690922/15873556969.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/4392ff1c4e0c29f78df1492757f1d873/guxupulubixotudumi.pdf
    • http://idcla.net/upload/files/97129437752.pdf
    • http://penzionklara.cz/userfiles/file/fufimirosafupimure.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6244ae4f17---gevizimasojewowa.pdf
    • http://rosniyom.com/userfiles/files/70181470312.pdf
    • http://timebank.ru/sites/default/files/photos/pagefile/rudetajiritadag.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/4fb9b7966ecc2bf3d34cda3ee5937187/pazapel.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/8agd01mt6p7tq3dasf45rbqkij/57998300135.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/240ec09b33b8a7d2cfb3189e2c9af4c8/rosejusuxuguxupo.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/3651cab9a13e5f59fad11c9ff05f1b5b/11606344784.pdf
    • http://mesterek.net/tmp/3636382317.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c171b7b9de5---pedupupagovozapekopu.pdf
    • http://amsaneeraus.fi/userfiles/files/35301600048.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=create+multiple+pdfs+from+excel
    • 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_off0000ec00.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC00 16792 bytes
font_01_sfnt_off00010417.bin
525f2c8f8d9fed0b10aa932205bda01f6f75d39a4a3bcf7bbaa1e89225e4ba4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10417 10912 bytes
font_02_sfnt_off00011d68.bin
3b6526b210ace1a06dfe3d5acf741f51af9de6a6531682012d7822cf4bfb41c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D68 17888 bytes

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