Malicious PDF — malware analysis report

Static analysis result for SHA-256 a47def7ebf7ed315…

MALICIOUS

PDF

81.1 KB Created: 2021-09-11 13:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 27b8eaf17ab1c8e610fb83d2afc5a798 SHA-1: b9b8db3ba37d346dc882d004fdfb8a2915d44f5f SHA-256: a47def7ebf7ed315329fb8889a265dade79a5a87346d00076b1f6b393f367562
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=a+doll%27s+house+text+pdf PDF link annotation
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/bumaluzuw.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210903121415388002159nsi.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/29524852165.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/89839177576.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/15616820873.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/98896768485.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613924a7bc73c---51203979262.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/39312783961.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/xovavozotifaxevinina.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/64760648471.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/26889541072.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/dekagavigezasosed.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/a8d062f9aaab6b7cf962e14664fca450/bimevanejalikodo.pdfIn PDF document text
    • http://kahasat.cz/data/file/vawepire.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/4p4iabffvkoit8e0vcef25um74/vikokipupesupuxat.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/78004180.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/kejovadizewujavo.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613968c122d1c---mogigukefuvavofab.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/45067293250.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/7896376865.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/pufimor.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/45392630922.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/264deb2907d7765c5cf150966f8914ad/10098603688.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7c04dd0dc---34896018178.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/b057468c1c0eab1c9173556e257d4500/retikobilikegi.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_off0000d979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD979 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF190 10352 bytes
SHA-256: 69106da735c5a791db0db290a6ccaf5ba5579c291e5c24f11dea15de7c280d5d
font_02_sfnt_off00010931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10931 17656 bytes
SHA-256: 3143800b2784c0600a43e63d74e5d9b1c5019d38f67a72a3bce550cfab5bd276

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