Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdebea75c2c50f29…

MALICIOUS

PDF

92.4 KB Created: 2021-06-29 01:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 38452d45a00575b09b912801f5caa712 SHA-1: bacb3afd29129e9dcf29a325157eb77ad3536498 SHA-256: cdebea75c2c50f294f242725c9ac88e09dca900df3b4f04a8ff7115fc5888cf9
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs that point to compromised WordPress upload directories and other disposable hosting, suggesting it is designed to redirect users to malicious sites. The file's structure and URL patterns are consistent with a link farm used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=diffraction+is+a+special+type+of PDF link annotation
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/161401eef8cccc58a0b580cd3c9f42c3/91580008375.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210624150017150163hotoz8uga74f.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/tidalowexof.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/sitekamasafu.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/79673595724.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160abfa118b91a---lusoravenegu.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/hlo99mtqg2uqjnb3d7f4qtel0b/vikegiwujatigin.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160c564c26a883---todekobesuli.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/ruzinifekijabum.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/53492039720.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/bec02cb545e5b5c131328013a206a293/17204828252.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/a54eea74c96b456e89b1439644944320/35776403746.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608824f73a17c---74381517222.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30e3e37b64---debodatalerukuzipebuzaw.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/29256090504.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820e39d6baf---gavaw.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c771986abb---52201741513.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/imbhqcj1dimc9ke3bu5f1rrc0h/51489108957.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/38363648040.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608349d89773b---82256458867.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b88da6df68e---fanabasimalipawob.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f801bc6adbec9e2e7c48e838d897c2ce/rijiwomibagibapapab.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/vncnnfsuh6s0c3c5182n465vjh/bewet.pdfIn PDF document text
    • http://camera68gialai.com/uplaod/quangtri/files/27976611924.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_off000103f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F2 10588 bytes
SHA-256: 63111bded0d72b8cd8123b326ded300c58e36b4bd06a4922b87f7ed679d14617
font_01_sfnt_off00011c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C50 18028 bytes
SHA-256: 8a57d279fa7469297eccb74b46177c7cf5bb8f3f872f48461f1161e264f2bce8
font_02_sfnt_off00014c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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