Malicious PDF — malware analysis report

Static analysis result for SHA-256 0994464f50a7ad7e…

MALICIOUS

PDF

95.6 KB Created: 2021-07-09 19:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 78ca8f988a4533bb7fd3a84817d7478c SHA-1: 0cf04b7a08d35cfd970d266cb7d8b1ee9e76cd88 SHA-256: 0994464f50a7ad7e2c1ed50cbe81606a17658d77a89d5064cbcdf58207f63a75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, but the PDF structure itself is used to host and distribute these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nomylo.ru/uplcv?utm_term=how+to+find+c+in+sine+function
    • http://westernmaki.com/uploads/files/52967119834.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099406f86e77---dovitodupozutejezilodef.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a221bd1a250---tusalamajumoxifate.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9d7061610---13345184368.pdf
    • http://tiszaikaland.hu/upload/file/92591368505.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080f5188f61b---fovanulo.pdf
    • http://mrpokedb.com/uploads/files/82130758056.pdf
    • http://allycatering.com/userfiles/vitigagi.pdf
    • https://cape-electronics.com/media/file/79743174102.pdf
    • http://hongshengfish.com/uploadfiles/2021062411230627700.pdf
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/0rhglggjjjifnirq12hqur83d4/xovugefitijivekufelekuf.pdf
    • http://evevoyance.fr/adh/.-/file/50511897723.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607db0a890e3e---48550149216.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a26fbf0ba---lejomesefovosizoli.pdf
    • http://supair-lux.hu/ckfinder/userfiles/files/vinujawetapufiledigebut.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b46377cba4b---lipeni.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd2eadb32c---lunob.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/7d0261894029f550ba71c0131c055d7e/26312168723.pdf
    • http://kleiberit.ru/files/file/4332318261.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/fsin0h6cjeoi4rune34lg0ubg6/87496432596.pdf
    • http://goldenpeak.it/userfiles/files/14880607258.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/b6ee9f5d0c0a4be8c29c4ac47bd7a1e2/4976073426.pdf
    • 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_off00011460.bin
2be4b59ed84c89aeb2cb4d2dce7a6247c32fb5d16f6833202ff75c50589f80fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x11460 17192 bytes
font_01_sfnt_off000141aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x141AA 16792 bytes
font_02_sfnt_off000159c1.bin
6ec7f5d64d3fc55e0db6fe1e0b6f2484ddd66c9f4509fc6b95fcfe1b11714b88
pdf-font-stream PDF embedded font (sfnt) at offset 0x159C1 10340 bytes