Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b9c58b67d404a4c…

MALICIOUS

PDF

74.7 KB Created: 2021-09-25 11:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 8981ae156141e5bb1373f82aff90ac95 SHA-1: f317c5875b8c9a4f62f8435626d1ae8e344a0a2a SHA-256: 9b9c58b67d404a4c921da53d2ef6a443fa2c6cd31af19ebc5521933e68084591
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF. The primary attack pattern involves luring users to external malicious sites via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://oniceh.ru/uplcv?utm_term=hack+sms+and+call+apk PDF link annotation
    • https://desco.scp.hr/files/xemez.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/demujugoxavorazudu.pdfIn PDF document text
    • http://hdg-gmuend.de/userfiles/files/lejagigatuvijususadu.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/wotulegesuripavej.pdfIn PDF document text
    • http://medrea.ru/upload/files/pofoj.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/9683316019.pdfIn PDF document text
    • http://friulanapanini.com/images/file/50294590515.pdfIn PDF document text
    • http://suranareecommand.net/UserFiles/File/zivaxafagajuxixaxisiwi.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109020449238058.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1614bdecd39041---jeliror.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/mutevefugapakosiruzine.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/levezagebumozolelev.pdfIn PDF document text
    • http://dgkno.cn/upload/92146929749.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/9612473516.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/8f92320f6577f0d858a63a049c4345ef/zofunanizosavonuxeluda.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/jefabiwuna.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/96270324103.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/tizafefozikame.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/1994957536.pdfIn PDF document text
    • http://innotack.com/userfiles/file/84779244674.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304f174bc7e---70567895631.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16145521a27524---76992414073.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/devugusubabo.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/zaximazul.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/gixumoziminezof.pdfIn PDF document text
    • http://all-premium.com/user_file/files/weropov.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_off0000bb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB59 10216 bytes
SHA-256: 984dae259f36eb3339ca1d3bf98e5d4da8e75003cae1e809d24d733a87e75e26
font_01_sfnt_off0000d22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3F 18852 bytes
SHA-256: 9c0a39b4621ca8751b0f2b08ac13cab64b26177fbfa2e7c01b0cbc6b9b349323