Malicious PDF — malware analysis report

Static analysis result for SHA-256 90751885ac1695a2…

MALICIOUS

PDF

83.4 KB Created: 2021-09-17 16:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 465b95cee09d17e4e661e8ff001025f5 SHA-1: eadcbfb421550b4163456e0deee7c5669b558944 SHA-256: 90751885ac1695a202076639bdecd2011212e2bf865233f553a4283730769beb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised or disposable hosting. Heuristics indicate it functions as a link farm, potentially luring users to malicious sites for phishing or malware downloads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://magiepourenfants.com/images/mediamanager/file/84693174965.pdf
    • http://batiment-tunisie.com/userfiles/file/puzitigimi.pdf
    • https://tiemhoamo.com/data/dulieu/files/natavobudarigub.pdf
    • http://100gastro.cz/soubory/files/dabigabijefuvibuletemine.pdf
    • http://vanprodukt.cz/UserFiles/File/demineguvasenug.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/1f01f33b8532aabc334419dd5f7623b4/62743732247.pdf
    • https://calprin.com/ckfinder/userfiles/files/51996940487.pdf
    • http://kemenyseprosiklos.hu/upload/file/mazataxaxawep.pdf
    • http://soc-in.com/data/media/files/wejisoneriwitegasisi.pdf
    • http://majortaylorride.info/images/uploaded/file/govuguxeni.pdf
    • http://andlupa.com/userfiles/file/94882276531.pdf
    • http://zhouzhuank.com/v15/Upload/file/202196214444172.pdf
    • http://parfumland.sk/upl/91015096224.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/5nci04g40o0vprprkmg6epaqe0/30097421075.pdf
    • http://rayhovietnam.vn/upload/files/45544025792.pdf
    • http://vizugy.hu/uploads/files/10085831075.pdf
    • http://myphamhelios.vn/luutru/files/42217283370.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131fd36d6efc---31523890553.pdf
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/bifosima.pdf
    • http://momsystem.ru/public/file/88599944522.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/8bbiip6ok9e4eb8l54suhurk71/23682694415.pdf
    • https://hagakure.by/upload/editor/files/xoxosenas.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=best+texas+hold+em+app+android
    • https://www.posluh.hr/ckfinder/userfiles/files/suvusajupelawomixun.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_off0000e1a9.bin
03717b2775a6922b466dbf08a58d7ae1061569544af7f3ea4c0b1210d461359f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A9 17420 bytes
font_01_sfnt_off00010efa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFA 16792 bytes
font_02_sfnt_off00012711.bin
19d9da8609374c81579e3a78ccfd97578ed45c8e843eebeb084fcfcf131de082		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12711 10812 bytes

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