Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa6534bde43c8f7e…

MALICIOUS

PDF

88.9 KB Created: 2021-07-08 09:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2d37422f2b7df97cc520533ce95f262 SHA-1: b8c661616ef3d31b37e6c990b3f51f150395e88c SHA-256: aa6534bde43c8f7e4b6ba85003b225550eb9403e2cef8b27d16149d033a09f0b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. The document contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm designed to redirect users to malicious destinations. The presence of multiple distinct hosts and a high number of links per host indicates a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1af1422dc6---gukimatoxavogejopoxarute.pdf
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/mewumujado.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/50f09de1c27f3f2ef6bb88b97003039e/82679052764.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ee2610863299e6cbafb6489f61acfe61/ketevesovejujotisumomaj.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/8affa6896d5baefb6c17bc3ecce2b5d4/vufidef.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/i9slfbfllo0vojspp0vvsnrva2/bumakuxadobipusakanawijes.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef05335ae2---nunitojijikifulatowa.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e45b889ca37---22301175271.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/6bfcf9f80b04dba224955d231a453597/71147808225.pdf
    • http://haverfordhigh77.com/clients/e/e7/e7c5a96ea35a64a1345a575153f12e7e/File/38481268464.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/2megndsjal7llrb69u6sisdfc9/tazenor.pdf
    • http://studiobardinisrl.com/userfiles/files/zomugisejoxetazupexukovu.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731e846193f---laxejimomakuji.pdf
    • http://tourister.kr/userfiles/file/65015149738.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b86bcaede2c---34743968208.pdf
    • http://cropscipublisher.com/files/upfiles/file/nekifukorolonuwax.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/16bf2fbb843c1b521c9fd9f825bc384e/56769251456.pdf
    • http://nemdanangpho.com/uploads/2021-06-23/images/files/datupurulanupabixuf.pdf
    • http://liburnia.pl/userfiles/file/nojawurujijabovuxosik.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9505e9281---6906370903.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2cf07d065---jedepibesarakusinipuku.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608234dd2bab9---58962210442.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/4i4k77einelob2ckqseat0mj6l/xomiwov.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=life+board+game+instructions
    • 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_off0000f684.bin
2025ea89964f8f6a8def3dde74aea7bae9b7662b7b9876e55aa84a81f3cb3e21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF684 10972 bytes
font_01_sfnt_off00010fc7.bin
efda0619708af43b49bc9ce4393e274f54b3531a8da9d933c6fd57fd7a26a8cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC7 17260 bytes
font_02_sfnt_off00013ce8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE8 16792 bytes

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