Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1ab6ea7cd9149d7…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 09:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 84929b24c7ecd711d8e228b1b8fed982 SHA-1: 6328561d835a9739634d8e7898a6cef55549643f SHA-256: a1ab6ea7cd9149d744544401b77f849d0af0a95ee9833d537083e83d2935c7a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://rmduncanrealty.com/userfiles/files/82643512638.pdf In PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd695945497---xovelemebavivobuxafejivo.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/lasutalaberijekepefesir.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/23bf1beb70385d66c49ddd2dd932ada7/lusajowogebegotafoneguvo.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/3572249674.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/gokamazex.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/aai06bcbuvbrlf2bcosed1eunb/zariruzavujoxukij.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d67eec676d2.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9d0e5630f---duzudotudavavok.pdfIn PDF document text
    • http://onlineexpert.in/userfiles/file/15333056029.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/77676983140.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/40627097610.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/53216818836.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ln0a21snu4qq19btqd3kp709to/sobadi.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/b0f2956e0e63f69149d2351f842c4098/56679368399.pdfIn PDF document text
    • http://tulsacentral1963.com/clients/3/39/398188050227c7f1c8b3045a0a865105/File/nezivobedutobofifososu.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/60444742011.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210716041748.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e22348b663---44816671677.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/18bfds094ntvsipe0f3l78l7p7/gutigexawojal.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/wejudal.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/nixarevuxego.pdfIn PDF document text
    • https://razredna-nastava.net/files/26475567036.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/garefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=life+is+short+to+hatePDF 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_off0000df80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF80 18016 bytes
SHA-256: f7fa9a00a22e6f84c801789ae52113e23b5fbae9cb4fff88a51b7908e3362374
font_01_sfnt_off00010dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBB 10120 bytes
SHA-256: 9b226e5bb1f041979896a33add8b8438ccb02944ad48cc71ac794e827036e101
font_02_sfnt_off00012482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12482 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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