Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe9ea64306516dc…

MALICIOUS

PDF

77.8 KB Created: 2021-09-06 10:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 1cc047a2ba6dfaff36c94f21f4afd86a SHA-1: cd804d4e129e64cdec466f5470bc2dd82f8f2011 SHA-256: 8fe9ea64306516dcafec02c85ef095efbbdc41b17792bf39153aa5ba6fcea591
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://interiorconsignments.com/media/file/85736686340.pdf In PDF document text
    • https://groupunsur4.com/contents//files/gigewuxiserile.pdfIn PDF document text
    • https://marigabung.com/contents//files/77534294631.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/4bc2ee3d9fe879458fa067280c33d2e7/xubatafubeta.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/ginagula.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ed6ec75bc---zofevawafuvod.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/2d92d37b59c58a630319a196f3645ccf/60878992801.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/96123584647.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748c5a86e04---wajidorejozenumekidewap.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16080d82e82dc7---zazanekagatal.pdfIn PDF document text
    • https://inverpalmas.site/aym_image/files/80241174510.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/88557954110.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/9nvjcqs95elv02oj6t2q8q9jee/88825320565.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/ielhc4sq0vj58eb382htd8oql1/riwetavofeveweliz.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105fea9b5125---kupumizovajipivilowuwid.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57f7b03092---55223367491.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c6c9ab71f---10106039688.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608ac41c43f5b---bobofurujutu.pdfIn PDF document text
    • http://omg.su/upload/File/dubimemurilinuguret.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b215934dadd---24608012576.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8f77852ff---dilemex.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/88d91db8d38a8509dfbc9216a691eb8a/33287662925.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/uu98l17hdlavso995hb7p24lu8/24079146127.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/78175080111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=ap+us+history+worksheet+answersPDF link annotation
    • 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_off0000cbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC8 10676 bytes
SHA-256: b90cac0a10c42fec5fefbc6a597b01cde40f0981a20953ce2fc681327c05b22d
font_01_sfnt_off0000e460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE460 17672 bytes
SHA-256: 30af1612167703ffd38a6ff091fbbdf4ae2d556efc1f2752d9ea5e36f88edb0b
font_02_sfnt_off00011224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11224 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1