Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0a9ffe4535bd73d…

MALICIOUS

PDF

90.1 KB Created: 2021-06-26 07:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d8926c4b41453b6b3d190d5898678e01 SHA-1: bcb2849f9a1426cb60fd4295a85a28d29ebc0b7e SHA-256: f0a9ffe4535bd73dc2d875ff0909dfc4547126f07fa233f449a345510f3e815b
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is used for malicious redirection, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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://smidgel.ru/uplcv?utm_term=terry+ives+stranger+things PDF link annotation
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/tmhinogok1e21ucc9dknv08sst/jefelurovawalijone.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/simonududowut.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f532af0f5---33570696272.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/99548706520.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4444603941.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0687b9772f137cbd3dbceb8d00bbd678/pelukewev.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/1a09495044484dd3b0e2cb4eb59d9f88/fuduzuzikibifuxaberanati.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb5b5292caa---36068323070.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/31091572289.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c05cf889b66---63850052558.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080931d5d3f6---58367050383.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/db375253b6bd3ac818695af52907e3e9/fakatakodivipudi.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc8de352a1---numekitokefasudikedoxam.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/lidaxuzinegivawugoles.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/sa9guomdgkpv54ft742jh8cdt5/7305282741.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/74922409836.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/6d4194e971ac886fd8b1d4601d13eea3/98105108485.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160734b4baf9e6---lixojufavutowofuvewedexa.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/76593700350.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f7853b672---rotus.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/jumokujuvixixewemak.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/l7hljalb77tjjfdj6l9ujaj4dm/topubexivedobizemiw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b26d0ebf5---razoxewedisibitajo.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0e7c985e9---viruguvobexinamalefu.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_off0000f8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D6 10364 bytes
SHA-256: 14890720fc45b4c53ef626245d80297fa6d99374421537ddbca64bbe70571bd8
font_01_sfnt_off00011044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11044 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12856 19344 bytes
SHA-256: 5d7b09510e529c28c4d1d772e96efe579fdfcc9aaa885081ed205aff2e6664fb

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