Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67069bb11d38d28…

MALICIOUS

PDF

81.0 KB Created: 2021-09-08 08:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5380efc372b52748fededa30760a6b59 SHA-1: 02d939e4f0d2e4fcae41812f3142d2f483fb199f SHA-256: f67069bb11d38d28447f31ca8eb3a1b5d4b53c19094ff76c907adcb1cc4252f3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external URIs. Many of these URIs point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=symantec+endpoint+protection+manually+install+client PDF link annotation
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/l9l02mva28985q0b0lgbe739nd/jewusulo.pdfIn PDF document text
    • https://morabia.fi/images/file/8148059082.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/8032170.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73ae2297d3---wasulajikikuxafujejumive.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/34089626556.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/54937906934.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/pasadijufojomipiguda.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608713b64d0bd---27742568186.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/34d2bcbc0e56f7f32d3e9b8eac824b40/98484730342.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/b7qh8p3bpih3p86f7fpf3is7n4/gufejabanukawok.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1fdc5e1d4b---wepokuxosedimere.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/69dd1f6ca53ab626fe853e341d77fa9e/josepitakuledowamos.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/ziwamuresubowigan.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/tumivebimami.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/26599125766.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/jiladip.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/melefoxe.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/1661947618.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/d19055bff5427177a37b67fda10f37b6/80513718252.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/38255290078.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d19092706---tadamek.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33379865765.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_off0000d68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68B 10964 bytes
SHA-256: c8ffc872ef215ba717f2fe000f7f66871c613ca8edb729c0c6a24ee697b696e4
font_01_sfnt_off0000eff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10807 17760 bytes
SHA-256: d027b50db653b6458475e250830fabe06c51b920e4b65d07f52ad98fcaa14cd5

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