Malicious PDF — malware analysis report

Static analysis result for SHA-256 804420f412231d5b…

MALICIOUS

PDF

67.9 KB Created: 2021-09-27 14:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fa81733ccd4d120c4325468e499181f2 SHA-1: 05d2394a66e7dd7ea248477c66c48156d4941199 SHA-256: 804420f412231d5b37b53c78a79792257f92602b3cd027827859abd6ff59cbc7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to numerous unknown PDF files hosted on various domains, some of which appear to be compromised CMS uploads or disposable hosting. This pattern suggests the document is designed to lure users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://suvagcentr.ru/userfiles/files/nuzozebemeretajupab.pdf In PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/47266503507.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/68057139325.pdfIn PDF document text
    • http://phanvienphianam.com/uploads/userfiles/file/67845012117.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/linebaguruzinijatopi.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/zegokosumekesovunu.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/47342005519.pdfIn PDF document text
    • http://bdn10.cz/files/file/17118652284.pdfIn PDF document text
    • http://12shio5.com/contents/files/77135150936.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/35972373540.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/tobatekuseriwilurinaver.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161303afb436f0---14789951890.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/kaxunemujulereparulunir.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/53995870572.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16149847447683---wipadot.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d13f5418be---17511040966.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161430f9acd849---nigovatinojor.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/21740697104.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/wimodetimo.pdfIn PDF document text
    • http://4tyres.nl/public/files/41493562520.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/86904881079.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150df8c046f7---10298002940.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/7778328865.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=cleanest+android+uiPDF 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_off0000ae2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC645 10372 bytes
SHA-256: c1a86675cfb8b7c29866c2b1739c755ad4aed5d0182ff20fccc168300f332449
font_02_sfnt_off0000ddd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD9 14640 bytes
SHA-256: a8bccb8a7a3836ef720ab7f8ed0cae8ce847e810cb3c0e5d3e14ba1ab99b5f82

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