Malicious PDF — malware analysis report

Static analysis result for SHA-256 c763b6468f886f31…

MALICIOUS

PDF

83.8 KB Created: 2021-09-21 04:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 41165042cfc99c70501e4e3061962f2c SHA-1: 0dc41c6abdadc3a1addd125879ee3541380b33ef SHA-256: c763b6468f886f317ec401b9a657690482ad59f0c6aa2560fac797b2517a5694
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and other potentially malicious sites, suggesting a phishing or malware distribution lure. The PDF structure and embedded URLs are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://dagvandearchitectuur.be/_files/file/nolijorufo.pdf In PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613774558ab4e---91304405312.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/72065891547.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/24557675095.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/u5hsnqe8tm65244jd43ibhrr77/12950060037.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/posuxuvejamizaxivoba.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff747d364f---pikuzuxulobasajatesujusoj.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/61968853488.pdfIn PDF document text
    • http://profstil.az/userfiles/file/99568830409.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/19913292883.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/lofixisop.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/29762201246.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/49508952554.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/polegagimivirerip.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614476c676536---nosogimovurewexapow.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/nufazanozavuravas.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/45306721900.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/66039287841.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/29886535192.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386ed1dff48---92520008030.pdfIn PDF document text
    • http://yejida.com/userfiles/file/moxatorizijofuxanekujuvo.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090308235416.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=format+otg+fat32+androidPDF 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_off0000e002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE002 18992 bytes
SHA-256: cc36aa7d0c16b642851fe952461d12fc01119f1d3d8d247467ffc9a4d6c2357a
font_01_sfnt_off00011131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11131 10620 bytes
SHA-256: af5fa9fedb1182f8a0f27ab29bfbb4a29fd5ab9f4cda99cbe657967db87f6502
font_02_sfnt_off0001294f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.