Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b468542fc037ee8…

MALICIOUS

PDF

88.2 KB Created: 2021-06-27 04:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41cef7ee81972ef5ca0363a61d2b9402 SHA-1: b712c738a06981e7afae338fd141f47fda0d9df8 SHA-256: 7b468542fc037ee8ab142522dc014de852251c57244a3af54dae8d8c562daa8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload storage, suggesting it functions as a link farm. The presence of embedded URLs and the nature of the heuristics indicate a likely attempt to direct users to malicious websites, potentially for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4b599e5c9---tetajuxuzirirexukav.pdf
    • http://location-appartement-venise.com/italie_documents/files/55779389442.pdf
    • http://adabaskimerkezi.com/upload/file/56423342327.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/qcf9rrbbp96a3san5p5gc3qi64/51413058270.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cf2a1743d---zusaxevebugedanivag.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cae058b850---webodimudejuxorex.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/1o69cqh13mco0827n1un2dppm6/wonapixukupenuku.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/f31a3c0c522902cf79a5c70ef6675753/rikadujofiduzalufed.pdf
    • http://toshiteriyakiburien.com/uploads/files/24858375689.pdf
    • http://toyteepee.com/uploadfiles/file/210517195342772754x2wwk7.pdf
    • https://abofahed.com/userfiles/file/77747543069.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/5f18293a298e1969054773e6b5aec341/21160946279.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d97c22c7b---2975040982.pdf
    • http://portalpr-b2b.es/img/user///file/_0606789001624226085.pdf
    • http://waypl.pl/upload/File/jajuxodosibanufigusa.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba50b1907---25736508027.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160822151a45c6---16706555627.pdf
    • http://ipublicity.cz/data/file/nomidasojixuvagu.pdf
    • http://yangpupark.com/uploadfile/files/1240634469.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a969c0e06c8---17576387114.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606cef2c6b550---86202441437.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608646b8ae454---39961901700.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9eccd108a5---betotexuj.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d2eece861---momovuxuvotadimiriso.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf957d5881---91162724378.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/3homaitidd8rjqd55g0uuqibm2/47660861515.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec7576fe48---lemukosupadijifajered.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=no+4+plastic+recycling
    • 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_off0000f457.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF457 16792 bytes
font_01_sfnt_off00010c6e.bin
ca468ef78f61a8724024ad5302fd20c9e91c6aba29d2e0b710defdf2e81496d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6E 10716 bytes
font_02_sfnt_off00012543.bin
ad0a8e976a979b9ccca5c44fe1a836198faa21c05148ff96290af26f1940f9a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12543 17268 bytes

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