Malicious PDF — malware analysis report

Static analysis result for SHA-256 7136dc6a77ba47ff…

MALICIOUS

PDF

73.6 KB Created: 2021-10-07 23:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6bb0f936ce49f2e719b909523e7bbf20 SHA-1: 3faa809e2c59cb844d2cc3a691b79a5ab47b9551 SHA-256: 7136dc6a77ba47ffd96e798b19e163ba278499e2f3c2cb616d63d2914ed7d05c
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The PDF contains numerous external URIs pointing to various domains, many of which appear to be disposable hosting or compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure and URL patterns strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://synerhu.ru/uplcv?utm_term=sehri+and+iftar+time+2020 PDF link annotation
    • http://banquat.com/userfiles/files/kagoguja.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/26825308819.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/jibajodimed.pdfIn PDF document text
    • http://beiks.info/public/file/ninivosalube.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/zozofiwuronesugojivi.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/tusapaguzofafixo.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/5058921498.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/86063852280.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/puposupisewut.pdfIn PDF document text
    • http://life-homeshop.buyout8.com/asset/uploads/files/43888057329.pdfIn PDF document text
    • https://ags-car.com/upload/files/35164835955.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1615d4f20c5125---35854998914.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/222d5d3f94e8d0d7ecef0cad523894a1/36312542253.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/josagilagapusowuwiz.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/ninokevazugil.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/97665446473.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613c311342d55---76412276824.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/sozatoxipuvojox.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/zitoziwu.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/38485414423.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/759dfef9009d7ad16ee542f9bcb75e93/94917396213.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/zavakoxenuneloxo.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/76320c7ab5e26de8374d9db48c316695/jiwaludavizimedumeziva.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109250016232560.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/6801669660.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/sizivelodaduwede.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/22055479805.pdfIn PDF document text
    • http://globalcentral.net/contentupload/fckeditorUploads/organization_/file/28366935231.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_off0000c052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC052 10600 bytes
SHA-256: a2be9de8c13bab0639d72a8c5590ea8f43a9ff14af600ef30a1451a027fa4324
font_01_sfnt_off0000d868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD868 15728 bytes
SHA-256: fdd4e43e0eadc68997ae17bd1bc634d3f7ddd6c721fedcb6e0720755479cbc41
font_02_sfnt_off00010063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10063 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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