Malicious PDF — malware analysis report

Static analysis result for SHA-256 2216593a60759e2f…

MALICIOUS

PDF

86.4 KB Created: 2021-07-08 10:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81e6dae33dc609798637d2102c710256 SHA-1: 43ed76f4ee5e7282101c9670a0f5ef619cd305e2 SHA-256: 2216593a60759e2faa57416ccbf6e4fe8dacbd2d593b496f2e15e2a737a658f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and URLs pointing to compromised CMS uploads. The ML classifier and ClamAV also identified it as malicious. The document's structure and numerous external links suggest it's designed to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/fowib.pdf
    • https://euro-commerce.bg/files/43346665941.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9442d56fe6---pixilazu.pdf
    • https://posaonakosovu.com/ckfinder/userfiles/files/30734940957.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f422f3961---gijojaduwefejuduje.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/ce8a340e604c207b9489ef48b8b5b8f9/gerukejaveputidit.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/7511e4db4fabf69721a6b63ff97eabe6/77637836619.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088a018221d0---pekarexiwidonatumolasitu.pdf
    • https://gtselect.fr/ckfinder/userfiles/files/63552757154.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/oebh1qivuq3fmsfn2pnll5r7g1/kogepari.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af42c139aa---6836207162.pdf
    • https://yellowstonewildlife.com/rupujamuzuru.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac83a01af9a---xowatavupod.pdf
    • https://lesartsdansmonjardin.com/userfiles/file/20210614211629.pdf
    • http://aj-logistics.com/stock/userfiles/file/58560593796.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/21a2f749d3c6c95930927ddfb720bc99/4574504731.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3605957d4---vidimipufavetoz.pdf
    • http://songhakbbq.com/uploads/files/32655688293.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc7f3d7ad3---munuboluxere.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/1q2qrf6mmdog0jo7euttu0n7tf/98885244686.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83be30bb5b---22828043376.pdf
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mivotukominexevupi.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adcbcb879e0---99820193986.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/ba790ff1d0fd3e52a986f0830f398ee7/zibomolodovepusunipalek.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=area+between+two+curves+graphing+calculator
    • 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_off0000ee24.bin
3333fc30ac4d3b71c2b821eff1302ff4cf2b7e84c8e94a9ab013f8aae7d62722
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE24 11028 bytes
font_01_sfnt_off000107a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107A1 16792 bytes
font_02_sfnt_off00011fb3.bin
836a20cc40aa2cf99c7a95e1f04912fc27bee47e031d2efdf3a78244488bbc43
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB3 17028 bytes