Malicious PDF — malware analysis report

Static analysis result for SHA-256 465da8da93dc5213…

MALICIOUS

PDF

95.1 KB Created: 2021-09-18 04:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eb92e3de246fd86aee9acfd86f4077b8 SHA-1: 3fb97766ffa9fd6b4cb9b9c5ec6a146090a36fab SHA-256: 465da8da93dc52135f423875cf7851491baaf8a6c288f527569f8b188044cae2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to distribute links across disposable hosting. No scripts were extracted, but the overall structure and URL patterns point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://laborke.ru/uplcv?utm_term=free+instagram+followers+trial+instantly PDF link annotation
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613916b09cc30---lobifunutisojorami.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/89043869842.pdfIn PDF document text
    • https://guruvinodji.com/Userfiles/file/4673693215.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/tevubejufonugixiw.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139d114d62a5---kuxeko.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16142fc165f810---gidoribabasejifizemute.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/92207783413.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/gowefum.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/21828092700.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/79141622532.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/penidijasomupawos.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/fawajod.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/vovitamilaw.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/sadorurubivexajepodabaf.pdfIn PDF document text
    • https://porfic.com/fotos/file/dukutijuzowineza.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/55924898238.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/gugakalotadefaxirar.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/82812864542.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/84170393149.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/96102254541.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/pasozamokizobelakodi.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/rizobunakopidopoxo.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/kesabokosavibig.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/66081531196.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/xemiwugulozenoruwewo.pdfIn PDF document text
    • 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_off00010e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12628 18416 bytes
SHA-256: 2edf44560eb0ac9126f95a7a6c89d7a4132b727feb9c69a09b2069bf7999b929
font_02_sfnt_off00015611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15611 10732 bytes
SHA-256: 6130c6d0ca5670f0c3c138c94624a0a09bb3e7a55a361f2781bb82990e3fe514

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