Malicious PDF — malware analysis report

Static analysis result for SHA-256 dffcb488671d111f…

MALICIOUS

PDF

89.1 KB Created: 2021-07-17 06:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0548d0fa090505d1f2a2a8f72f06e87c SHA-1: 7f75a294c18502af96383b3e8bbe326041f1999f SHA-256: dffcb488671d111fcdd6c220855901a07d78d34b83773582f266907f1d001f25
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://west-holding.com/userfiles/file/naridejagagafuguwer.pdf In PDF document text
    • http://naturallabs.fr/userfiles/file/benamazewubiz.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/nakejukozov.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074532491368---62490811855.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/pekubabinidumebebudaranon.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/37b79e1a73df383e09c4f87c0b7e4194/32763308388.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/10179477798.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095118762ce6---wodegu.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/tovomebuj.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/d9fa24f0675ae3641dfffa9defbe05f3/panurifivipekopi.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607039d84cf88---xupimovoraxexufipek.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/94489475147.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/vesojodugufokan.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/lubok.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/43146339216.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/6702089189.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/29243669010.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d98741835f5---zabuxugakolezokijeje.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160792c71efa29---64168091129.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/28577020731.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/rb4165mrstl4nn7tmfnd30i7rt/xigovojozag.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/29557e142bf9e538bdb8f77adb745481/sojuwuvamuvogobuwiri.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9954bd859---56849153913.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/h0vau0ovi2u11ck2m0jj897bh3/nutozaboxexifefop.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/70921968720.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/77498118062.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/9fdc0437447167497e5f3f4b234cc8fa/41562531823.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/tlf997g7d930obb5jv7k6ru4cp/duwobopewemufefubejule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=bricklaying+subcontractors+near+mePDF link annotation
    • 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_off0000f65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65C 17908 bytes
SHA-256: f3dfdc60f0cda43b7d76e1e1879e642daf7f685cfdeb3fb6b9843fb1ebf63daa
font_01_sfnt_off000124fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FA 11072 bytes
SHA-256: 45812263161a6e83c77665d7f5243d49b75bac635f5d500867bcc1ecaad8238d
font_02_sfnt_off00013ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1