Malicious PDF — malware analysis report

Static analysis result for SHA-256 674da47886e41f7c…

MALICIOUS

PDF

83.0 KB Created: 2021-06-25 15:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f5e2f2cdb476d981cbf72b3f5fb67f5 SHA-1: b8365501c794f37c0f9f2205a18d72add2b73d0f SHA-256: 674da47886e41f7cafd7d12d4c3ef50a074de879594e83185c43f6bc09d47517
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The heuristic firings indicate this PDF is a link farm, likely intended to direct users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://oniceh.ru/uplcv?utm_term=direct+appeal+meaning
    • http://muzeumostrowiec.pl/obrazy/file/sabuzuraluja.pdf
    • https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/307945e14fd5381942ad948e457b91e6/jaxuforane.pdf
    • http://ondrejkocar.cz/img/file/18117129738.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e873325cdc---pufujubago.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/d1psaj7i2tvhie56dark602cqh/65482638318.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/v73lo29a9opo04d3e9oqegvub1/88591507104.pdf
    • http://ipost.mn/ckfinder/userfiles/files/45160562955.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/821b8ccc084d554471240696cb90fc05/tiwunaporibunejogonazu.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/963132794be06acd1808925b99173ca0/32451487721.pdf
    • https://fwullong.com/upfiles/editor/files/38964697730.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/e6b82882db981d5c33ea6e5ce7718405/nowexisotazajopusokikam.pdf
    • https://pui-vital.ro/msg_media/file/62862433225.pdf
    • https://flyags.com/editorResources/file///zaviranapewirifonigale.pdf
    • https://bkht.vn/userfiles/file/mikoze.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/5iuib2q910hqm8bkus3bcatvpe/rimogujasuj.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/8bc009b16223d2ab38da10c56ec5d4eb/dizabuvuzuretemudavufid.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_off0000e485.bin
2d110cc45f3d94ff7aee1d96401084460bbd75014a1f07b7d925b4673f756c5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE485 10432 bytes
font_01_sfnt_off0000fc1f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1F 16792 bytes
font_02_sfnt_off00011431.bin
a398c5f06bf8b04d9af4a581366044c38366df18dc59dbbebe7eb3ed071635ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11431 16728 bytes

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