Malicious PDF — malware analysis report

Static analysis result for SHA-256 349626c3ce2df658…

MALICIOUS

PDF

70.7 KB Created: 2021-09-14 13:37:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3947da5c74d3cc5fe88239f6a0901f20 SHA-1: 387f7e4d5c63a9f3c3aac71397893e58080a3027 SHA-256: 349626c3ce2df658cd6449e8caf39c846a4d91c9f2f2ddff83f26625df3fc6d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. 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 link farm behavior are indicative of techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://exclusivelimoservice.com/ckfinder/userfiles/files/9735330851.pdf In PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/98545634588.pdfIn PDF document text
    • https://digireg.ru/upload/pupujofibisikozigoxidok.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8edfce825---42473886079.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/29785970127.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/zodilenixosuloxuwak.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210905_161132.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134a647183dd---20811873527.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/49669346847.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/26827325310.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/95459268036.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/tikedilozadipefukin.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-5/20210905005840310219.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/vimuseviguraxilam.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/86578115412.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613148840bb91---84539369207.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/17152410510.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/sujorujigijaridokinobo.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/xemiwugulozenoruwewo.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/kegolifoj.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/gofuwemetete.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/88963452819.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/40757854554.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/gotogegegekilep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=what+is+your+phone+companion+link+to+windowsPDF 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_off0000b319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB319 16388 bytes
SHA-256: 492bae670667438c63f47378f42f7b828047e042233d76e4712f17bf1252b46c
font_01_sfnt_off0000db36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB36 11164 bytes
SHA-256: 68f9b6e86307798560fce474add1a6b6689e46e696687fe9fa4d167d9b38856d
font_02_sfnt_off0000f541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF541 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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