Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a590f59d83dfd7e…

MALICIOUS

PDF

94.0 KB Created: 2021-08-11 17:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 966f39faa95274d9a2f0493d5c4cd621 SHA-1: 04eaea1de88268dfb4288a32dbffa69cec92f20e SHA-256: 9a590f59d83dfd7ee42eed55a39c6e10e7b8c9e6e2f075fa16a1006d30d4315e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to websites hosted on compromised CMS platforms or utilize UTM parameters for tracking, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://alzubidi.com/userfiles/files/nodokaxodilape.pdf In PDF document text
    • http://stalmost.pl/userfiles/file/nuxanulojap.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/rj80ukvfgv8ruh7pgjtuhlfof4/bipokedakirivofinu.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/f7c660c7a82b50cbdcdecb3f347a072b/21799868491.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/88842167903.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16099dd3170bb8---49400364362.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/hcn12e8gksu46lbi1q52u0j2nj/sosaluxatode.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/3954991823.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/lamaba.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160edb50881a2f---benameful.pdfIn PDF document text
    • http://mrsgladysosei.com/clients/f/fd/fd76c46f75d01f7adbe86f52c2a5b8c1/File/jorasitalakakofekus.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/28842381362.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/58378760661.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0ad8945a5---95856367431.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20217152036205858.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/werulazisokoposofe.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/dfs2900v17dn9qv8t9h13fpk22/71388936316.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/rufunisu.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1bf2150c7---42304364784.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/senofasuzidopep.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/gujotuvigazarud.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609757ae59665---verekewuwagilamodes.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/kuwovirogitu.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/42885298474.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=traffic+rider+mod+apk+hack+version+download+iosPDF link annotation
    • http://janyska.home.pl/_mjanyska2013/fotki/file/poxefataduwawiwed.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_off000107d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D7 17432 bytes
SHA-256: 1040b0f9b2c15d30bdcd8fed2819a42d48d1279eb9f6027592d28d747ed5b192
font_01_sfnt_off000135c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DD8 10996 bytes
SHA-256: cb6e8c6bbeeb14220726439643ffea6a494fce57efb69a689424c161ffacb3bf