Malicious PDF — malware analysis report

Static analysis result for SHA-256 11fa33d4cd4b508a…

MALICIOUS

PDF

86.6 KB Created: 2021-07-18 02:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 092fe66da1e2ab4b85f793792623093a SHA-1: 5d733000774c1f58b40b73e76b550ce66d5ddc31 SHA-256: 11fa33d4cd4b508ac8fa35ec9ff460134489040c1e5a05f22e7f07022880dd6a
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution campaign. The presence of numerous PDF links and distinct hosts, combined with the 'utm_term' redirector, points towards an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://anfauglir.com/images/file/puvovixotagilesiwazodafes.pdf In PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/435cd2aa0bfcbe633d97ca3946d4a859/nunajutilava.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16095594118ccf---5614837368.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/26811768849.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/6208c977cf44a6d2d0129fa6be64f0c7/bexalogakebukazeluzagiz.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/294727517d2c123b289cea369521de33/95320029066.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607105887e669---powox.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/9eluj7lg6upon44914hd928fp4/41003425986.pdfIn PDF document text
    • http://kotolantopeni.cz/file/dusubalapowidifulekufigul.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/fuvemizan.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/u242r77isgutdeunpknsbvc24m/48865833993.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/c72d81e9d43ee7b6ac67ede21f39794f/zajiriwarezatopeno.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8a8d5c03b---mekofujakag.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/u93gi8rg6gkml3gmm49gmic8vv/muwozudigebe.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bce20439ec4---revusopasogiliparoxaf.pdfIn PDF document text
    • http://bscartridge.com/pic/xadanawaxo.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d60abdd97---mafotef.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8895ad7596---zaredazixew.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c89480a91---64341435489.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16098e5ac85f0b---bimomebigowa.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/b6357abb76d310de1a354c7ef4a3596c/fasutuzakilopuvosotero.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/wurikuzojobu.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/kirigivokeponogi.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/neneguxupesubilegunebatu.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/wixewaxexugibixifesetovas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=frostbite+is+caused+by+which+agentPDF 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_off0000ef8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8D 16900 bytes
SHA-256: 7992448a66f8d7984fadea08d738451843e4fdaee492a1010efae27c1c5c613f
font_01_sfnt_off00011b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13398 11020 bytes
SHA-256: 4a76aef5cf96b5233bc3a41085ffae8592456139ffac1195987e330504847e7c