Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7843524cf3d60ca…

MALICIOUS

PDF

79.1 KB Created: 2021-09-03 18:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 91b8c0569849e63b15174bf52425aa01 SHA-1: e8b1ea73b96e65f848fa2620ebd59480e2f7551f SHA-256: e7843524cf3d60ca57ee4e923ef330a5b644dec7207dccd5233db94845bcb813
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan distribution attempt. The file contains a link farm pointing to numerous external URLs, many hosted on compromised or disposable domains, designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an intent to redirect users to phishing sites, aligning with T1566.001 (Spearphishing Attachment) as the likely initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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 https://medvor.ru/uplcv?utm_term=vinayaka+chavithi+telugu+pooja+pdf PDF link annotation
    • http://szjglaw.com/uploadfile/file/2021082504044273499.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/lidivubukopavaruzir.pdfIn PDF document text
    • http://nnhs1964.com/clients/a/a2/a2d7b74ded15306de89ee4bbe2f7ed3f/File/duzadobekuxodojegasix.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/80810703653.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/3924d212276f23a944abf334f6c60180/93482205857.pdfIn PDF document text
    • http://bliznacite.com/files/sikinebuvoxovobuzutuwaxo.pdfIn PDF document text
    • http://yongqingtech.com/d/files/gilijiriwatalugezixid.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607887c5947b0---98480430141.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/91363174576.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/44569781377.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/porotukujebakezazogu.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/zasejabubitaduforatike.pdfIn PDF document text
    • http://njchemland.com/upload/files/10966770025.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/88a668e8e74b0def167dc18a8ac26fb6/77461711933.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/17617214718.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/wixuwisazefukibowesi.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612c1dc508f2e---tojesobukigonifanitawure.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/19499070187.pdfIn PDF document text
    • http://chhsclassof64.com/clients/b/b2/b21d6454c74b38f294a67049e63db9d7/File/47499797429.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/zepiwiwekuzubosadikunubav.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078dddbe77e9---42750145174.pdfIn PDF document text
    • https://alariel.be/userfiles/file/zajukor.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90aa6b853---romujufivev.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/77068068998.pdfIn PDF document text
    • http://palami.by/images/file/33208561035.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609753e2cd5d7---lewapidukapavagug.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/85944419853.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/9445808175.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_off0000cff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80C 11100 bytes
SHA-256: b87ae157eddbe28b421c961996fe8c85c9aedc721069e2684808cb93ef663dee
font_02_sfnt_off000101a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A9 17248 bytes
SHA-256: d9fae9b62f110ffd16bdbefbb2a1c059ede23058cb33fc76a19bd5c63b108f23

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