Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cde4de2412c59a1…

MALICIOUS

PDF

80.1 KB Created: 2021-08-29 08:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9031110635d464f032a06dea0e5ce827 SHA-1: ccf1ab3fd1eb6a2d1adcfe401b75b34599a4b9e2 SHA-256: 4cde4de2412c59a1f6478378a551decd0744cd41d015170b2b70ddbccb5d67bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage or appear to be part of a link farm designed to redirect users. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to direct users to malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://sgrappresentanze.eu/userfiles/files/11308954508.pdf In PDF document text
    • http://stalmont.eu/userfiles/file/70007355323.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/faviwuligonibeti.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/31758574194.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16085b4a5e94d3---39482188144.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/34714524402.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210825_061639.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/nazaregomeso.pdfIn PDF document text
    • http://kasargod.net/uploads/file/61775834949.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f336f2b59e---diroku.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/3af9d229342288c1b60e237346f6e193/viwotalolidawupesibesoxo.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/7c5e2cf0746623a42f3c15438ef26e30/genonubu.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages//files/46798921591.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/kovonokotu.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/8cnhou3t38jmp0g31tcv7mcv4h/76529465335.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/sipofapeborol.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/8a258a82d1b2ba5c998ffd77fbbc4e17/kixuj.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210716_061508.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/20o0fcdvmb76uovkldm660hn04/retizuxibasoxakitize.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d50e5833ae---76045518023.pdfIn PDF document text
    • http://massimoandyuethui.com/clients/69227/File/pegukogofu.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/57740587928.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/xipaduriwabokipujobesopur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=what+country+star+just+came+out+of+the+closetPDF 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_off0000cf05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF05 19436 bytes
SHA-256: 3966dbf616dc4d7851a1ab1a3831cee9fa86735a23cd6d01ee4320c5e267ec74
font_01_sfnt_off0001011c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011C 10848 bytes
SHA-256: 70b9d2c27699fc0e3edfaa126c0776cac7643ba2b80d61702fb264d87702076c
font_02_sfnt_off00011a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1