Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a1bb78addc729cf…

MALICIOUS

PDF

99.0 KB Created: 2021-07-13 00:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b807807f836b42820a30a45f4fa24eb3 SHA-1: 5b6eb5d80b43c21d645641559fa1b7e52c0a2bba SHA-256: 6a1bb78addc729cfa0e9275d4cf84595d12a0564e191ecc70a40a587709831c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users, potentially leading to a second-stage download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • 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.
  • 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://garglob.ru/uplcv?utm_term=honeywell+vision+pro+8000+owners+manual PDF link annotation
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cab46446c7---85634945611.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/lupid.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/3350027265.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/46b497t0qtc8d2gb890p310k76/fibafatiseruxovezitojebop.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/35775419485.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/sefuvimuzawasosapaxoz.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb6a41f360---70502890038.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/10677457890.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/fodikaxubewunikalejadibo.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160a2737e4d552---vawavizetitape.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/674351e4409387f5945672823186315a/tajotibawifuzotuge.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/10300915814.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844808bbfe9---kodizofixefoxududi.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/46962466801.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021526121113095.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/zefufapanup.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/xamafuzatunuxuxaxaf.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781502222d1---83171002801.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/9183650bf173c5fbf11044c7f5d0e4ee/68757884923.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/b07cea9b91e4b729658bd8d9ac30a161/rotuwizelebatoxalobiwix.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/a4552a56e1501b529f0018e460f6c459/89863662746.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/vijufusede.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071d35204389---67692457870.pdfIn PDF document text
    • https://tpk-m.ru/files/file/duxalalesotu.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/8223463585.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_off00011ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD0 11000 bytes
SHA-256: a7864a02cc287a4c1c782f5fc17aed648fede36fabf09aa857beeed15c1cd829
font_01_sfnt_off00013463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13463 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C75 18500 bytes
SHA-256: d4011288557cff95f29fb0ce3994f91eb2044d1672a81bbe417032a48a4aad05

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