Malicious PDF — malware analysis report

Static analysis result for SHA-256 6adcf57f907e862b…

MALICIOUS

PDF

73.3 KB Created: 2021-09-18 01:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6c1c6cd90377ab6dc59aefbf88b28b5d SHA-1: 3a4160e53ab5ac455c339ddcfb758647cb141d26 SHA-256: 6adcf57f907e862b33ef3e3af5bce0fa252944690c52afc07ac7e714b0097a18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many of which are hosted on compromised CMS uploads or appear to be part of a link farm strategy. While no scripts were explicitly extracted, the presence of external links and the 'link farm' heuristics suggest the document is designed to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://pistant.ru/uplcv?utm_term=how+to+print+scanned+document+without+background PDF link annotation
    • https://hoangvan.vn/wp-content/uploads/files/42287042209.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/29314144481.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/16257966493.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161451b9581ead---wepubo.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/buxivaxidale.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a022e8edeb---rawil.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/beremegunenadikowavov.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16136b8015c422---nakenijukaxiden.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b272ad0efb---22839273973.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132d68fbd1ca---megolawikugowopemojev.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/70498807671.pdfIn PDF document text
    • http://www.heksan.com.pl/file/ruxavi.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/34628888630.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138745a40d9b---jowogoxojebadenanonupe.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/13468510139.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/45548152673.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/domirenodab.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/36796557941.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/32692745594.pdfIn PDF document text
    • https://lordoptika.hu/files/files/25886940486.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/qlkpqs5j2ia8123sp1eqgq5jkp/suwuroxometim.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/vutig.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/50123259636.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/89643446842.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/bakixeginesubudutisefir.pdfIn PDF document text
    • http://taigesw.com/upload/files/jodevuxixojorubawo.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/sadoxekibozetosa.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_off0000bde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE3 15376 bytes
SHA-256: 449c9e5146e9fc052b2b2c50ddbb3819bb88c7acdbd436f28ef718692fcb7c8e
font_01_sfnt_off0000e4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDF 11324 bytes
SHA-256: 0503ed53c29eeb25d6a4e2fe05798b71a143039d809ba52c8e9f9a5b1b06feb4

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