Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6785fdd2eae6fec…

MALICIOUS

PDF

86.7 KB Created: 2021-09-04 04:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: adb953b53a7643fdcc829a43a144471f SHA-1: d8f7813fa09ef52473c9598f054c3c55c20e6b78 SHA-256: f6785fdd2eae6fec46ee6c0086e649e4002ceafe712ee8b414b36a10b67ad9bd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm, with many pointing to compromised WordPress sites. An embedded JavaScript stream was also detected, suggesting potential malicious scripting. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=24+italian+songs+and+arias+medium+high+voice+pdf PDF link annotation
    • http://thucphamchucnangmy.vn/uploads/files/22076934307.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0e4167d08---87930878355.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1d6c2ef75---pavixoketizu.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/28296019941.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/basafowevajo.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b6923ceca---89469404308.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/55163ddd66dbaa80d8a02af4460c3dbb/jokevidixogogemosowefip.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/7esms9shgo47g7iq298ifmilkf/43118988187.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3267c5aa08---8019416887.pdfIn PDF document text
    • https://kuepancong.com/contents//files/95757937314.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ohobeks55385sr0fjfpa931rf5/wosakofapa.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/movuwobadego.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/a7lav1csigtgmnkc1ao6l0rb4m/95082356385.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7acc65544---19262020422.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/c96oul8a8hpo70jolrv5cacifm/bunonapudedetodigikoxa.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/naromu.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/60027073011.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/dijaraxebo.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/lotigi.pdfIn PDF document text
    • http://fourfoods.com/images/files/favotedofukubititefotelu.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/1357643df7801f9a8bf6897aaf47e58f/41900142973.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/46d5b2684b02a025efa99ff270287723/gofuzudarisoji.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_off0000ea02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10219 11336 bytes
SHA-256: c39946ee8074bfc197b6b36a0af4de71478a9466c85f31d967681a54ef4c50a1
font_02_sfnt_off00011c71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C71 18432 bytes
SHA-256: e0b64867e35743e3566505ed1f00b4c259c7d8739258ba15dca38c6b92904aa3

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