Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c5314306f903bfa…

MALICIOUS

PDF

86.7 KB Created: 2021-07-27 22:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6c2c751acf34c992e75e99eab55e19cf SHA-1: d0e7336c4f189f166981a42b4bec7e07d4949e19 SHA-256: 3c5314306f903bfa01e62524b754a440b8a589a900cc9de0d7bfe6affd05dec7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://polkovnik.su/upload/file/femebifonolibinivurifawon.pdf In PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5aafa1ba3---nutubog.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/jabafinenurisepopus.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a4715e725b2---33340445844.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/tefaxiwovakuruladokuru.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4b3c0988d---nuxugumizoraruvugapovufuj.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/52597458629.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eae6a920a0---64555045452.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b102f20367b---64153048518.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/vojimef.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608862439a42d---supovopebozazo.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa5386c28d---sivexunefeguj.pdfIn PDF document text
    • http://www.rotudavid.com/ckfinder/userfiles/files/50027514927.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/dumukitu.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/65442587359.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/63426758750.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///11555196709.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/wasetobojejugawigewatupil.pdfIn PDF document text
    • http://cooper1972.com/clients/b/b4/b451ebb09e7e0345645526f893d9a49e/File/99347911968.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/77180505565.pdfIn PDF document text
    • http://deckdreams.ca/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/70187980957.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/13f0608bc9b5adabac63f4a59410f954/kaxapexakadonokuga.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/b334e49584acfef015a7f9e1effcccbf/sosuvupodifareratavawef.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/bokurafoweviwefejiwanupe.pdfIn PDF document text
    • https://kawanmto.info/contents//files/repavabifijaf.pdfIn PDF document text
    • http://chikatere.com/Upload/files/zaxisugadez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=exercices+corrig%C3%A9s+sur+la+mecanique+des+fluides.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_off0000ece1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE1 16992 bytes
SHA-256: dcac1bb289286c1f76fece7f573aa33b7420514d3584392d21cd57b290ad4fb4
font_01_sfnt_off00011793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11793 11416 bytes
SHA-256: cfa3ac536859e12376a25138c050756dc5784de365b35a835c599ab17b0584ed
font_02_sfnt_off000131b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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