Malicious PDF — malware analysis report

Static analysis result for SHA-256 5872de7211b060e6…

MALICIOUS

PDF

86.9 KB Created: 2021-09-12 14:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 14f8e91ee7c88665ac6b3438a99eab76 SHA-1: 637c5a8f2d3c9b5d3036f003cbcd9deb113cdbae SHA-256: 5872de7211b060e689ebbfdbb121237a12452150aa6cb8f724ab9cb939c956a7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, including a link farm hosted on compromised WordPress upload storage. The presence of JavaScript and the link farm structure suggest an attempt to redirect users to malicious sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://escalierdurire.fr/ckfinder/userfiles/files/32008527066.pdf In PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613757623fba2---gavilo.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/xuzobutovajobuwiki.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/72771305191.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/65961088906.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/vipifaninulipedixasasu.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/61772596435.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/50985860950.pdfIn PDF document text
    • http://terminsk.by/pics/files/28822230644.pdfIn PDF document text
    • http://linza-market.ru/upload/files/kopaganenasip.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/95488946923.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/2021921633.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/luvigofilosoj.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/luwuzakiximadusin.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/gururupuveninonefopupi.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/33635070258.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d79a257b82---ripipuzuvera.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/17942416398.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/44493050415.pdfIn PDF document text
    • https://parfumzone.ro/files/file/ninuz.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbfa6db907---38221808185.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/46288991661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=android+phone+games+offlinePDF 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_off0000efa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA9 10828 bytes
SHA-256: 53cb09e106bad81901cbd31d0c650dbde1673fc89882d80e50710ee76fe68696
font_01_sfnt_off0001082c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082C 17880 bytes
SHA-256: f3a5b4981b3841fb66ce8f0d2644097c45e820d3c92c61b49c254822f9a21eda
font_02_sfnt_off00013654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13654 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1