Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad4b4ccb0222a132…

MALICIOUS

PDF

84.2 KB Created: 2021-09-19 08:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 940adb6225b4f8cc476f54d7c3781741 SHA-1: 008745b376ffcc789b66cf7d585ea8a00643d353 SHA-256: ad4b4ccb0222a13226485c9fb8bf41451d582a5ba8f2189f2e86051b2b04ad88
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to various domains, including one hosted on a compromised WordPress upload directory. The document body is unreadable, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://familiegravesen.dk/ckfinder/userfiles/files/81929176286.pdf In PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/jhj64a0r475jrp0ejcsleop7ff/jovedaloxogoxegivu.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/99719540514.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613feb92f0da3---verusapusepovovof.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/62885793744.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/48940218298.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/65920619754.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/21737407605.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/45220066359.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/43304807424.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/modusuxonutuvusikuno.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/dariv.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614685fc18e09---33737495384.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/tivisotavabodelojipi.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/supatogerevopi.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/13615207711.pdfIn PDF document text
    • https://superchills.com/userfiles/file/motaxexamusisirulo.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/80483398047.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/3488103440.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/65159791991.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/jesadu.pdfIn PDF document text
    • http://holzbau-napetschnig.at/vubivolotamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=best+android+phone+in+4+inch+screenPDF 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_off0000e44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC61 17816 bytes
SHA-256: 9289c0552869ae4aac4f0574c59bd9ab13901fb7f782f0a8aeb79fa8d002586d
font_02_sfnt_off00012ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE1 10696 bytes
SHA-256: 681516d60f0620eca63c84ef525260903858b71da04f62731a7df1ca5065a8f2