Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a316f8b143b32d1…

MALICIOUS

PDF

87.3 KB Created: 2021-07-07 05:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d6809791848af3bf62084f2c7926a69d SHA-1: 642b02a4da8d07a185596d0de55a4d52e99d3f48 SHA-256: 9a316f8b143b32d196cdfe138a2238459f350b83bd9925fa7a4ebd728e6eec58
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, directing users to numerous compromised websites and disposable hosting domains, likely to distribute further malware or conduct phishing operations. The presence of external URIs and link farm characteristics strongly suggests an intent to redirect users to malicious content.

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://lapalettedesarts.fr/gestion/file/velepojarola.pdf In PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/68325934325.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/81574743657.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c0f9859b5---sosejilugokonosix.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/vorugisepomi.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202107021335.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/57322793617.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/83940498485.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/67445955ee8e73a8af9335ba24ae2dac/5992480819.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e601029f9---29909504256.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f70f131b7---levapolabegovemekad.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/676bf91d8252ffbaa8e0a57005dddef3/16598521739.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2024068dd---8149761222.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/4c12b2bcb025ebbe8e77753baf7a4192/fiborarufipozitujokezo.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/kupepinatat.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/f70df019a0b6c6622532362efce9bb80/85260427534.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/855c60ebcefc16d4c9749afae6e7a5b7/91049313553.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bccd4fad568---65881104214.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/menirexetedanijurot.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/60074883508.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e98db79f8---63078981163.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075ca1098325---dumuvexebovadep.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/39726884597.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b09c06360e---kokurovewatewi.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608af6dabce39---dizivoriwijuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=draw+picture+of+water+cyclePDF 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_off0000f219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF219 17324 bytes
SHA-256: 93ca515e8ee3e91315988f203e2fa77e83360023450d3fe8cbb1200d9099df2b
font_01_sfnt_off00011f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7B 10504 bytes
SHA-256: e9612431bb7ac13ccf9d225fabe8bc628135a4688091c01f752b59120eb80348
font_02_sfnt_off0001379e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1379E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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