Malicious PDF — malware analysis report

Static analysis result for SHA-256 197cdd42b768785c…

MALICIOUS

PDF

91.0 KB Created: 2021-09-05 22:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 81a383af6a227786c636efd65bd9b5d0 SHA-1: b9357e8f2371c848cc75f75b5296c09b41a8d40c SHA-256: 197cdd42b768785cd2f39f5200bc8d3373f2dc2feed35b853be2d2cda88080f0
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://beiks.info/public/file/85472715712.pdf In PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/nimono.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160899772437a4---14769046056.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/misevetopilojizubi.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia//files/53091575107.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/xapugafizusolebabesidolab.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/896302372e8e1986d77f59d328ce8c02/madupiligemadisi.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/1084b5280aa058f430c6a1c001b55732/72565483878.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160befd878b5b2---luxegixuvikojo.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/8247308286.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/88vpmj2ajs3rbn3ca9ptim5b05/34515391229.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/89965283371.pdfIn PDF document text
    • http://bethelcommunityone.com/clients/880032/File/33533604894.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/82923238177.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/84404579386.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/befisitup.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/sigedabepinurofuf.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/xoxetaxidirile.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/36eb654f0b522040532d19ba7f1eead0/jizoxuzarif.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/50488453195.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/jirumaxaduxupexi.pdfIn PDF document text
    • https://ecosolar-energy.com/piceditor/file/lozabomibebilimojego.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c91f63b656---paguvosanadikiwipifave.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=introduction+to+trigonometry+worksheet+tesPDF 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_off0000fd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD42 17824 bytes
SHA-256: 0a9430d2ce0ebb7692138ea3168d12f9949b0042a189f0442b3c4352bd7b6714
font_01_sfnt_off00012b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001432f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1432F 10952 bytes
SHA-256: 9615cf682ff1b4b075fea2edb57369b696f3c6a93a684b3fa3fbd9bc957430bf

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