Malicious PDF — malware analysis report

Static analysis result for SHA-256 797166674a5a555d…

MALICIOUS

PDF

70.2 KB Created: 2021-09-17 09:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aab126bcc8b3cb41355207f84cc4aebd SHA-1: 3d5caed43bcfd232f2b463d2b69488c00f7a8abe SHA-256: 797166674a5a555deadb687f1522aff6fbf2ab3d55600cffc254c27d1885c67f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external URIs, many of which point to compromised websites or link farms, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=gta+apk+vision PDF link annotation
    • https://www.hippocratio.gr/ckfinder/userfiles/files/61915616305.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021091517382773499.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/b17d8897af42dca53ce9e08426e2fbbe/73007047831.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/65053014454.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/siwadak.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/85667079962.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/85194342591.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/vosesemolevukanonogule.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/jarewelirufaduju.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/23621970858.pdfIn PDF document text
    • http://sswjeans.com/files/56235581316.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/seguruludi.pdfIn PDF document text
    • https://tckontrola.hr/files/pifosunaxajusibanodo.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/68a8a4473ef799e298d2327911413b88/98310495717.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/89882535240.pdfIn PDF document text
    • http://flathead.herosuite.com/userfiles/file/23557140109.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/vuromobonakib.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/67210604826.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/a85cc4ce7d632ddfbdda48d4fd16b476/zumefum.pdfIn PDF document text
    • https://farsiherbal.com/cache/fck_files/file/5917993396.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/51799694246.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/geruwemomerolepijapi.pdfIn PDF document text
    • http://parentini.it/userfiles/files/lobujotulixulotarix.pdfIn PDF document text
    • http://saint-party.com/media/file/5813948451.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/veverixolelawumusepexumov.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/nimotitebamijunosalu.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/torixofuverififoji.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/87538673395.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_off0000b517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB517 10164 bytes
SHA-256: 5ea2c82d53935bbc133c6fd50c9453e920eaa319e6121ac5c2e40d0267966a15
font_01_sfnt_off0000cc05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC05 15572 bytes
SHA-256: 32177998bf1bcf37c0a219bcee3b19f15200c352faec1d3f4d9364dd3fd422f5
font_02_sfnt_off0000f363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF363 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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