Malicious PDF — malware analysis report

Static analysis result for SHA-256 a66271a3ebda8686…

MALICIOUS

PDF

140.2 KB Created: 2021-07-23 03:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eac81be218b199faa149a091ffefd9aa SHA-1: d6f6e864e104316b7fbf1bc55c349586a27056f2 SHA-256: a66271a3ebda868690a39e221236b62023c052ce1b46e3b2b3943694247dfe79
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL patterns suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8763

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://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/14545130340.pdf In PDF document text
    • http://mcalesterhighschool1960sreunion.com/clients/e/e6/e641a1dc2b4fc8b0483efb779338bfbd/File/92130842492.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/zomuxopudonowitawewefugeg.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160803f3c2fa3a---25789026848.pdfIn PDF document text
    • http://katheran.com/clients/55933/File/51953584187.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091931187841---gudokis.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/toforejamiwadimonim.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a744fadeef0---21969485281.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/24760247221.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/bd612k99n9npgb6tj5kh9rr684/1294177077.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080aeca10784---xixit.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/1f317f8ed811a016bc6bae28cfe83fe2/75525384878.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/13386991647.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a07a8520c47---19394356834.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/namulojenirax.pdfIn PDF document text
    • https://ckd-otto.com/contents//files/7117686576.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab94cebcac7---69531966947.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/7thlla6r7pl5n8sho6sdrmfgm1/83230865263.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/3sev0kuf29ctpk1ml84sor8a67/risetufamipel.pdfIn PDF document text
    • https://dintek.eu/uploads/file/37645734262.pdfIn PDF document text
    • http://puppiesulove.com/clients/7/7f/7fa6d7836ea929643a3c23f4562b158d/File/28850299614.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/zawiv.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607d898f3ac74---84673933448.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/fuxovigukunedizu.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/10038011857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+write+conic+sections+in+standard+formPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A24E 20496 bytes
SHA-256: 9761e6090fcf2247854ed6efd64ecf095e7ade2c426e807b5c0f0c5343da319e
font_01_sfnt_off0001d8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D8AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001f0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F0C3 10668 bytes
SHA-256: 95f318da55b074005df44120f39381e74c9ab9cfe5768bba88e41a3d18d66358
font_03_sfnt_off0002093d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2093D 16224 bytes
SHA-256: 7dd5fb61ea0ea1e3370d26720032e9d3de5740e898843eef2fe92164eee2597e

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