Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e83adb11cc1e57b…

MALICIOUS

PDF

107.3 KB Created: 2021-07-30 00:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c98d2eb1d32655c48671a46a995a0bec SHA-1: d6e21cd20edc357d08befc5a40e43118f0f9551b SHA-256: 2e83adb11cc1e57b1f23a3beca1992c9184ff0e5a0429a6585e3f351e2bcba80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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://cructi.ru/uplcv?utm_term=genomic+dna+extraction+lab+report PDF link annotation
    • http://mytmbc.org/fckimage/file/94329555288.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160905a4022e5c---leperovulogodun.pdfIn PDF document text
    • https://genimmigration.com/viking1/uploads/files/sozobi.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/wexiwovikefi.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/rimuzixuvudexakozunepexuj.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609273dad1e28---rojakupofusubavatis.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/73157430765.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/73872367107.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/2e7c6523fc1a1c88332cfc2f03d0e404/42549409918.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/xegonakas.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/5759173345.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091fe3340cc5---55780770751.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/bciuds3gscofhbvhqln1b6jutf/95201986110.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e2b1b6a3414---lesadeperofekuw.pdfIn PDF document text
    • https://ebooksweb.net/files/file/xogisonunigu.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/nijigaxoxejupufewemijot.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///56988112996.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/rejezig.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3df245db3---18988474949.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/74052573721.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/70f2a01179747cd6a6d19c5b1ffa8e84/97537623554.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/0b58951f15d447036a48b5ea2bc503ea/mulegepunigoxetukedoloz.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caebba1ccb2---vepuvigavir.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/musorujoluwej.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160759afc01188---32059733165.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160de4cff3aa73---76065048207.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/3e5577021b61877f9bee7a9fabab8530/lonede.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E76 18016 bytes
SHA-256: b88a3c4f8aa4c13e1c0e71b34e9b371b965fa6de92a37291a4b083e8a540a80f
font_01_sfnt_off00016db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DB8 10788 bytes
SHA-256: 7e17920380388f47c6dd4b447b104f9512fb0f4e2938e999d25390525fd2dd67
font_02_sfnt_off0001864f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1864F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1