Malicious PDF — malware analysis report

Static analysis result for SHA-256 db23a1ff2ae19d43…

MALICIOUS

PDF

90.1 KB Created: 2021-08-12 02:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 045b0a375d945700cec60b87d2ae3d70 SHA-1: ac486399ed68f617ea620fd32915c0338d56738b SHA-256: db23a1ff2ae19d4338adf71eaa5fffd5b5df1d0ba1be939a5c522e03c02151e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, presenting numerous URLs that point to potentially compromised WordPress sites or disposable hosting. The primary goal appears to be directing users to external resources, likely for phishing or further malware distribution, rather than containing executable content directly.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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 http://thekitchendesignstudio.org/uploads/files/6500114206.pdf In PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075644c8e0e0---72998424129.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/kajozivenipekaluvo.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/vogipewezelamoteliti.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/69101796291.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f19efc76e2---dajomaxokemefexotir.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161067b923fdea---97640335874.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cea864e0f---10207473576.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/jawanuwogab.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/98f31a9e50bb43755e13921d9b4a62c8/22729377830.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/sefadelilotavanir.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/81472323390.pdfIn PDF document text
    • https://digireg.gr/upload/18181097133.pdfIn PDF document text
    • https://mytopics.it/uploads/file/22659832461.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/45897275603.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/27851860202.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/sotuv.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/96505273824.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/liur35npboijqg572jsk4h1led/89438378877.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/178c4c0b1ff282c8ba56575131e40e09/48018613598.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/4k5i0krhbqkbaqnd7vhmkjvgtl/83256911996.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/855ac1c556bfb5c67b349398f6ab268c/lorize.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/lozibefunuwexuguw.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/f6305430d1ed0bbf047aff3ee3acf32b/58982937179.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/xodefiragox.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/81331383703.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/b8a3933d24b8e4eb481d5a5b80f7e749/23321077376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=jlab+jbuds+air+executive+charging+instructionsPDF 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_off0000f3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD7 11176 bytes
SHA-256: 9ee520c8571fd5fd66f276352d0e6b9d0243f76370254970ff65bf28d45334f0
font_02_sfnt_off000125b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B4 20048 bytes
SHA-256: 8d44e3705500d6a4fef753dad0f03426681d3a64b0e497637bd177eb521f0250

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