Malicious PDF — malware analysis report

Static analysis result for SHA-256 145473d2314330c7…

MALICIOUS

PDF

78.9 KB Created: 2021-09-19 08:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d0be324b2fe8815435bd7e334b42cced SHA-1: 7aa42fac0faae7eb62db58fedc3271eaaaa1781c SHA-256: 145473d2314330c7e078a5bed61bd8ce33e3ccd677da8ef1c7e871e1a25dcd66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

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 http://besteva.com/upload/files/luwototulidozewuf.pdf In PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab5464f6b9---33278993503.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/90321375768.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/92167889065.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/22159055174.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/pozokekabij.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109110001006111.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109071833171301.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f130d49ca5---zusuremeribazar.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/fusuresudikodobujo.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/belameko.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/lowevopinijafezo.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/69597979283.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/94441464028.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16139ce26e9c24---38838999883.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/161366be0ab9cb---77696553706.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/belojut.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/kiximewuxidifadar.pdfIn PDF document text
    • http://turnyras.lt/Files/file/11643664184.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/pozegarovaxolifisepufot.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/48670228009.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/fizulatigaredejos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=this+is+the+jungle+kenneth+anderson+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_off0000ca69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA69 11064 bytes
SHA-256: 9a40b5242406105438fd4c8ab12a340421cfaca732999c793d4859d5b09ec856
font_01_sfnt_off0000e3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E0 19124 bytes
SHA-256: 4b4300b4904f86eb4a6270673fed48b9852368576c14d0d73b04d699f6867eea
font_02_sfnt_off000115a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1