Malicious PDF — malware analysis report

Static analysis result for SHA-256 2540bb2f8ff6b378…

MALICIOUS

PDF

131.2 KB Created: 2021-06-27 12:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 51b945bb04f73d479ce03550ae34acd5 SHA-1: 59988074c31dc7e9cba2d4c38718f0f3d07b7a84 SHA-256: 2540bb2f8ff6b37877042f879ffe9c18c964d608eae88762e26a980b57a74810
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users to phishing pages or download further malware. The presence of many distinct hosts and the use of 'utm_term' parameters suggest an attempt at SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a79a6c4b91---26899720379.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0c4031ee29c27e275ca78d3d60179f39/18241129958.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16083c47d53bf0---91515112944.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf2f3180b---20844199908.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/a6ee9ae7844c51380426a4584e445cd3/30823943857.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/df93184ba3485e7bbaf732f6a045d89d/84018128369.pdf
    • http://velo.hu/UserFiles//file/84309005568.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/jhqfm9ion533omnllga91b42i2/5840436888.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/s9899u22f6s17p4ig5m709u7a0/wojet.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/018e7ef63e0be487bb18a30f74fb70c2/rafep.pdf
    • https://vannordenvastgoed.nl/userfiles/file/kowudamunir.pdf
    • https://orrizon.ru/images/file/lonaruzizoludafijebovipar.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808cc439932---sarigobazomup.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160714fcb84d07---manow.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/e6eef6c4a930d8502c9a583ce5eef1b4/68714648542.pdf
    • http://alisawedding.com/upload/users/files/12379439900.pdf
    • http://sushibelovo.ru/files/napaluwit.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608345ba26020---jijapetadafokojipalunib.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7450180610---78178487832.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ae7499e23---jonekekilagelefavuf.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/3450654379.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cabfd00cafd---58029815226.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/0f5b3a2691eda39794b5a539fff9afb5/vebak.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607c62f26f97c---82413208861.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=stochastic+theory+of+aging
    • 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_off00019d33.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19D33 16792 bytes
font_01_sfnt_off0001b54a.bin
86325bebc1cc2976a938fcc36c4637689404f504223336cb7aaa2216f6325726		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B54A 10760 bytes
font_02_sfnt_off0001ce02.bin
d50992c800a425af0a7d6c6401972049ebdb362f7ee88e46eb4fcbd569d4d457		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE02 18248 bytes

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