Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7310530f6ba1dab…

MALICIOUS

PDF

88.7 KB Created: 2021-06-26 06:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9624cd76f54f2a9f4776e7bb7b8f8774 SHA-1: 2b7fe78496c67874da9c87649cd51e6549764eef SHA-256: c7310530f6ba1dab621f5b036e20409d091885209b718a0000583166f3d0d728
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the link farm structure and heuristic firings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/2f9f0ce4d88476e6dd6afcde356fb1bd/wezesidud.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/d57048dc9d25296a012a5c70187b9c17/41853758001.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb9584953e---97319254552.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079a9536ef31---mexetuv.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/tkof2g7vfkiqben76fcm1e15f9/gomamape.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/1e6a28825191edec63672bfbc1fc65a7/78397124923.pdf
    • https://steammining.com/userfiles/file/61320886982.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d64960543c4---710162327.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082e579eef70---mudivowuj.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/e476f2c1259c7fab75c03d17fa1c860e/lakojuvobuj.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/o79g9e9gm8ch79knconbkr650f/22971106505.pdf
    • https://bharatbiodiesel.com/userfiles/file/1576000523.pdf
    • https://pearproperties.in/userfiles/file/18225378295.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/npie8vcqsni72pi84fs2d32dm8/21466314496.pdf
    • http://remaining-mc.de/userfiles/file/xenuzevunukobukub.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/be4a2d6f28131daab1c9d9bfe8da7b8e/5680703628.pdf
    • http://afghansolar.com/userfiles/file/sutezet.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/t2nfceufkbollv8hlasqt2ed33/85835673724.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/2abc412a046f9ecd9c0d96cf1643bc98/32654347028.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160aac123d62f1---70457392071.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077af1468f5b---sazexibuxanajalati.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c2a343306---73184388110.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bcdee1210---27094936533.pdf
    • http://dissanna.com/temp/fckeditor/file/97413882401.pdf
    • https://cmoretv.com/userfiles/ziginikena.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=cisco+answers+chapter+5
    • 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_off0000f814.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF814 16792 bytes
font_01_sfnt_off0001102b.bin
62e71d6c4bab228054915cad4b2106e680422ae2349428f60f70b9e4d8f035b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1102B 10676 bytes
font_02_sfnt_off000128c1.bin
eb04d89be421e12daa581b655ec6c9cfaf06712359da4f4282da2b723e03f09c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128C1 16520 bytes

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