Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ff232a6ba36f659…

MALICIOUS

PDF

71.6 KB Created: 2021-09-03 20:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 94ff5f18f3a1416500eb7b3462036471 SHA-1: e81bfb31d7b06176e5a9650e1778b6518f85482c SHA-256: 2ff232a6ba36f659f3729042199b8293c5d4b80f4df2cde4398d99f19a369673
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://osteriadelcampanile.com/userfiles/files/68330496329.pdf In PDF document text
    • http://brickform.cz/obrazky/files/74261363475.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/63dsdtd3rpfgns72lvj1a0mr9r/xotigofutotunizugepepew.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/6cf043513ede184a5c4c7452e998e3fa/gaxuvedukaburotagejopufeb.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/zeperorinedup.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/78721181010.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/b4sr2vaj3b0qh94o7m6mucjud5/ranurozotam.pdfIn PDF document text
    • https://ebooksweb.net/files/file/67222774513.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/84207fb8c936644c07360d563b9a89de/potabulovebizelogiki.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/2483931b0280f49f0e398b5a49d90ae3/88422685435.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/zejurixazisofutava.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/widigovarogikarofuvi.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/b71996a5c9923895a8d32593a3ecb5c7/95559381082.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/zubobitivuji.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210601153507.pdfIn PDF document text
    • http://jfe.hk/userfiles/96574708014.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/fitifogobenujadojuwekire.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/laniru.pdfIn PDF document text
    • https://la-klamm.org/Files/files/76663494676.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/gugafum.pdfIn PDF document text
    • http://fteq.ru/files/file/jekomowewexazoxakuzilu.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/21e8d0dd7e6ab383a1de278646dbe597/zuvivisaxugavofamalu.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/i03ncktcvjujd8ksfk3010cqf0/jamipupokasofojotewovo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=handbook+of+early+childhood+teacher+education+pdfPDF 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_off0000b6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E0 10988 bytes
SHA-256: 2cfa1c1638c6885f4f8c8d2ef635bd1f415ec1460bd48dad719eb5c5fef3d68d
font_01_sfnt_off0000d00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00A 15916 bytes
SHA-256: 8627ee505e2d471e764de41c733b566e59687dc33e0e64bbf27b78261b3aee19
font_02_sfnt_off0000f8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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