Malicious PDF — malware analysis report

Static analysis result for SHA-256 887d86338d592542…

MALICIOUS

PDF

82.8 KB Created: 2021-09-15 10:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 18443b3f2deed7ce765b9cc824d3b357 SHA-1: 5da6195b1b2f4f5c515b5b56568d1c2eaf386032 SHA-256: 887d86338d59254299f514851570c47a0668b99a0b485fe1b9775402ce42cc00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://irlanc.ru/uplcv?utm_term=papeis+de+parede+para+android+hd PDF link annotation
    • http://theemasternetworker.com/ckfinder/userfiles/files/64133438714.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/42456448205.pdfIn PDF document text
    • https://graphicart.ro/fckfiles/file/gufebidaxalakizorevurub.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/20134899920.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/38049818072.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/gidiwofuvawipomezulepuvex.pdfIn PDF document text
    • https://beltamas.by/content/Files/52745256663.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/42925598264.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/dafiluguvivojegu.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/99938673233.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/45225801950.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/30815033596.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/xijekinevaw.pdfIn PDF document text
    • http://lawngo.net/fckfiles/pivekilid.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/47121387427.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/ep385t252isgoru7ul027bhor7/41280590823.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134d38024e59---puwedikosifametekirij.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/selujamasunuwapevevuxix.pdfIn PDF document text
    • http://landpas.pl/upload/file/23076315416.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/3b8b3f51442fc107d42f695eee79e0ee/85026769311.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_off0000da11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA11 10344 bytes
SHA-256: cd049b4402c75e34ee8fe95990a2910b42b9e53aa2a349c0f6ee9b5909d82599
font_01_sfnt_off0000f14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14E 20492 bytes
SHA-256: 4a46c97be750efc338a6dffda96d36aa7f5245dddb6794bf2877f9d2e531c93f
font_02_sfnt_off00012449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12449 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1