Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f85dd31b10dd92c…

MALICIOUS

PDF

78.8 KB Created: 2021-08-27 20:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9d0a6012ee63265a5f71ff4a3530ed2f SHA-1: a9334546accc88d76be99da0e92e9d22add690b2 SHA-256: 5f85dd31b10dd92c079861a55dab57b4ee766a858b18a1251c3f7042147c8501
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many hosted on compromised websites, suggesting a phishing or credential harvesting campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://chcial.ru/uplcv?utm_term=trivia+with+answers+easy PDF link annotation
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606da453db799---89689298515.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/7171132484.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/b85fba9b60d19f6fedbcb581631fc248/51796575035.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/qc51ct083tr4gr078rtq3iju5i/nusuwirafotura.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f65919712---bawemazubid.pdfIn PDF document text
    • https://lasanisports.com/files/64055660649.pdfIn PDF document text
    • http://mp-journal.com/media/file/ruwugiziwopor.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/fokureri.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/1ff00c8ccd782dcd451b3b47ad6255b8/83162079564.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/raretab.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/60759431196.pdfIn PDF document text
    • http://whs1979.net/clients/65916/File/29358614679.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6625758b9f---wodifa.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210519162139244215.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/74328494145.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d19ee615393cffadd8d426be454b942c/23436612524.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/66241783294.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57816ac5e9---967094529.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210820170643601.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/1b5795d4471fee44d778b225ed6d2c64/tesowuvawasef.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/51950348566.pdfIn PDF document text
    • http://raczcsalad.hu/files/58561026750.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CC 10268 bytes
SHA-256: 032c5f08e2fb3beae15a6de66c4a7d486e5be75d9e47c800ab3113ec82a022c2
font_01_sfnt_off0000e9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FF 16544 bytes
SHA-256: 6c22aac9ed39d0cdf1876481fefc89ea0e32c74022221c1eff119f30ebcaf111

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