Malicious PDF — malware analysis report

Static analysis result for SHA-256 25c3af4bdefd72ce…

MALICIOUS

PDF

73.4 KB Created: 2021-09-16 08:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4681c9529135850e656f67fa36ec3703 SHA-1: ec8805caa709a98733b0beeaeab30825c2c854d7 SHA-256: 25c3af4bdefd72cee5dd196ffd0cbc17c3b7106a8dc041d6bf1614f872bf5cfc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=wpa2+psk+hack+software+for+android PDF link annotation
    • https://biogenetixpharma.com/ci/userfiles/files/robokoseg.pdfIn PDF document text
    • https://sharenkon.com/files/22742421511.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/86561905078.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/11142909685.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba4c33300e---57695856595.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/12956971879.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/somivunubovulojakebeva.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/67160237564.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/86985635742.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f35da6ec5---64808261820.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/87437139198.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/71035956974.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/12956591273.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/vaxoxofed.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/rawilabenoverisodipapul.pdfIn PDF document text
    • http://thevalleytrader.com/files/67847885781.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16133aa1e4c830---95334621456.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/16020386102.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/91435416731.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/74288569271.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/kerutelopiga.pdfIn PDF document text
    • http://willowslakerhea.org/userimages/2824638913.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_off0000bb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1E 16928 bytes
SHA-256: 9085b0379a805559ff8108752af02d45050d106cc446ac97ee0f45c0fbf297f7
font_01_sfnt_off0000e6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F2 10960 bytes
SHA-256: 1ac6a5b45f1755c610ce77d17c0a9ebeccb59621dddc3ccf419be044fd1bca7e
font_02_sfnt_off00010088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10088 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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