Malicious PDF — malware analysis report

Static analysis result for SHA-256 6776e92f1c43d7c1…

MALICIOUS

PDF

69.1 KB Created: 2021-10-04 07:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5acb36b20799b6cfbb435970ce742189 SHA-1: a1b7ea8fbcaae4092c7a2656584ad8c8744a35b9 SHA-256: 6776e92f1c43d7c119e5070513525ad479d0005a8280c9d6d898562e08d17e0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple disposable hosting domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure and embedded URLs suggest the document is designed to redirect users to potentially compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://gyndoktors.de/ckfinder/userfiles/files/peborabiresorijipijutod.pdf In PDF document text
    • http://nhahanghienminh68.com/upload/files/83443762301.pdfIn PDF document text
    • https://upaspor.com/resimler/files/10207241686.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/foripevugusu.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/51688426689.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/vigilidewuvosepupa.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/k5qrdem3k44r3cndto1ujgjhm6/91859981070.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/silizomililosid.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/durano.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/tenanar.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/tavunim.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/62044286282.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/konigopibogop.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/puwegixesovomabiwim.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/63453855085.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/vezififezudasis.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1615433ea85616---renik.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f319fd825eaff5f428b8ff7dda427156/15400805020.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/36575443821.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/68537153583.pdfIn PDF document text
    • http://tochalco.com/uploads/files/vajakinakimiruxuj.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdd33dbeb9---57437057346.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/ximoxemapetunasebotejel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+make+an+amortization+table+in+excelPDF 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_off0000aeba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CC 15492 bytes
SHA-256: c8fa70d2ab4a64434364c02880f025fa181bee9e2155dc68d12976d201ca5f99
font_02_sfnt_off0000ee43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE43 10696 bytes
SHA-256: f72db40b390f69eea5ae92447628c289f228434527d4db1c2040f33fb636c15f

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