Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6ade39946a0ecff…

MALICIOUS

PDF

83.9 KB Created: 2021-09-03 09:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b248cc040e79afeef66539486fb8ec88 SHA-1: 06fa46cb181267ea6a48fc8916250eb54d0e09c1 SHA-256: d6ade39946a0ecff653c60ce55b2e1a7cd9008b022ff20a7abb24f6111c39be6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting sites. These links are likely designed to redirect users to phishing pages or download further malware, aligning with the characteristics of a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/l1fdnvbt58m2avpffs7tfa6gq3/vokonaf.pdf In PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/pafawiru.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/e7768d31db7e586c340a9e2f6d8178a7/21925911748.pdfIn PDF document text
    • https://defaico.com/d/files/68098039648.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16109b06f5e2fb---99384229495.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210616143809.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/vazaxoteparuka.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/safakefapepuweja.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160851bb0166b5---91236730889.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/11975354175.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/094f5a1330605a8d95d44dbd2ea24af5/7938274250.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/vagizaduxopemoro.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/3f7c5fb832b1a9e123901d58fda73abd/wapulibatajeforewikadeweb.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/97104520720.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ekoldnupbma302g9uet6075p46/30311138645.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/69180859908.pdfIn PDF document text
    • http://wchs67.com/clients/f/fd/fd50fd9748f3592dabdfdad26f378f15/File/jokekituxuzitituzewupene.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f32b74d0f7---bixuketeliruvipofetuz.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b071e0887---98148906528.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160af9686f0fa7---lofavikixijavete.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8a33854029---rinixuze.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/e10f4c5bba565ebad8b16fc0165cf9d2/mesupovijederawa.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/75e04c71d434b0643d367942e5d8f1c2/majuromawabur.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/puzositovexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=this+is+me+letting+you+go+book+pdfPDF 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_off0000df51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF768 11092 bytes
SHA-256: fd77896a0d8b336addd894f334fd7d712e277da55823ba1b17f1018757c56c65
font_02_sfnt_off000110ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AD 18936 bytes
SHA-256: 830fa91b3316aca966183346c9a37eb76e7f7ead63497a0853beb3365f3b364a

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