Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f38942935b8077…

MALICIOUS

PDF

70.4 KB Created: 2021-09-13 10:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a79b88c09fe0c3221daa7903f25b62d4 SHA-1: b1681ad15be10193e50c49f10eb12966d384e824 SHA-256: d8f38942935b80770eadf2c4294f437f0274e2262766b22a437a1d1faee5c9f1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript and numerous URLs. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, likely to redirect users to malicious sites. The embedded JavaScript suggests potential for further malicious actions, such as downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://inwebjor.ru/uplcv?utm_term=see+ig+private PDF link annotation
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/205302800.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/23269676416.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/41518169337.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/99394609038.pdfIn PDF document text
    • https://razredna-nastava.net/files/raxuzofi.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/33959125118.pdfIn PDF document text
    • http://wych123.com/upload/files/mirojotijupatuxu.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/tugomoxavupig.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/53286866743.pdfIn PDF document text
    • http://yejida.com/userfiles/file/11527576275.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/78101032701.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/56422316857.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/fovewutexidufuwizel.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/163bd73vbqk3a2e7e21j0iddn3/96043828845.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/7916ef22d0132c9bf6b2d67f8ed019a1/kobexavafifepumiwenamerub.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/6064507446.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/ramax.pdfIn PDF document text
    • http://htygroup.com/upload/files/biboxevupujibabuwazopew.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/ralofurosuxakadiramur.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/sinasi.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/15379315991.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/tegilev.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/72507945524.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/36694373178.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d25bc5d651---66713186491.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_off0000b7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E9 10128 bytes
SHA-256: fa58f9668df8c3f8db0d99a0a1a14b411a9a157aa9175a3f31917b3d96700126
font_01_sfnt_off0000ceba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBA 14860 bytes
SHA-256: 9e4afef91291d9d00aec2f2c17a7ab673317be8d677b2b2a26b83f28b6633c1c
font_02_sfnt_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.