Malicious PDF — malware analysis report

Static analysis result for SHA-256 d09dd4d067662d2c…

MALICIOUS

PDF

69.0 KB Created: 2021-09-24 16:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1a6d2216ceee2266fe4a7de93d912533 SHA-1: 60bb3faccbf79c30d316c7e3321be6aca0a4cc1e SHA-256: d09dd4d067662d2cb5540965af36794f005aadef6998caa9b889a38b8ffefe70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://laborke.ru/uplcv?utm_term=correlation+between+wavelength+and+frequency PDF link annotation
    • http://gldbirdgel.com/user_img/files/78217089049.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/gapapuzebalevukisuxedekat.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/sugavogezimutapo.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0540918001632298073.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/72175311200.pdfIn PDF document text
    • http://ktcz.eu/files/files/62363736826.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613429ccda916---30498093516.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/wuxana.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/74486193984.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/16262259984.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/88796778592.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/62061081257.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fa1ff108d---13423046618.pdfIn PDF document text
    • http://hzyixiangchem.com/upload/files/5696963446.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/tadevumew.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/60906007832.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/2521324461.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/79722719811.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/75331050248.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/14bf3a29e98d9e63396acb8d7d3b57a4/59457723437.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c8174d8ada5d67708d64ec7a71c60044/94080951546.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/8094849592.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/i5f9ea346jfb86ed0k6vmmqb2c/82707999544.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_off0000ae7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC692 11272 bytes
SHA-256: 1e8eb934890207b7deebfa20687863f5ebf7c9fbb47a81a4b8ec60a9d5f7b8e6
font_02_sfnt_off0000e088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE088 15100 bytes
SHA-256: 468cc1438b8f9d125ef6a37293638b57ba6daed80e4f79e57151df830615b168