Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc035b96aceee7c…

MALICIOUS

PDF

75.1 KB Created: 2021-09-13 22:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4b31c277c7ce9077bdb62844bc9d9219 SHA-1: a1c133653d529ae13a13421e411931014dcc3ae4 SHA-256: dfc035b96aceee7c9df3ab5236d572867d61ddcbb13d5c90330ca76e35da771f
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 directories and disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or exploiting vulnerabilities via the linked content. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://mbjarrahi.com/UploadedFiles/New/file/57143629253.pdf In PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/b027f28ed2aaa08fa4006cf4d4f1581c/todij.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/48862044515.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/nilojapo.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/kuvezomitekevopewogo.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/1956878166.pdfIn PDF document text
    • https://zagi.hr/files/99475819162.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/59908699764.pdfIn PDF document text
    • http://kechengchem.com/upload/files/96873061.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/zekagan.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/jixasidinimifuxobolajo.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/20793112359.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/xeginowox.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/55043160335.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/sadegumav.pdfIn PDF document text
    • https://digireg.org/upload/jeluzikobevimuxa.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/91289835754.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/3d976b1520b02b008432c56425c44bfc/niwad.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/7f5924a7df50bb81dd573f06440ff7c7/94574163946.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/palub.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/wotugorazadidasejozamuke.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/26531225361.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/27765140282.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/19432646669.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=adb+all+commandsPDF 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_off0000c0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B8 10232 bytes
SHA-256: d5b47ee3f1429b4e2123be3655949f1e5864e4a11b0ea3fa5aa8e7ea10468c08
font_01_sfnt_off0000d7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBB 18236 bytes
SHA-256: e029551ca966c28611061217a5e19381f5f1605291479ff3251f763958cbbd4d

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