Malicious PDF — malware analysis report

Static analysis result for SHA-256 8164d01130ea9632…

MALICIOUS

PDF

87.5 KB Created: 2021-09-17 20:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3f85677a74a65f530c00ac44f334523b SHA-1: 53a6f339affc08b99018bb76ac5bf5717be38090 SHA-256: 8164d01130ea963225d79aa58341ecea085e74c82c3357daaf22c4821eb9e613
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' directly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://vinadesigndanang.vn/uploads/image/files/pexikovoxi.pdf In PDF document text
    • http://thebankcardservices.com/uploads/files/99044001256.pdfIn PDF document text
    • https://edgecs.com/documents/30747359370.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/80074876324.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/zavovow.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614073d2213e0---59026472053.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1612f717e09465---94291572489.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/lv573molrs7o3d7dotqm31jaj4/favitapujonowebeforuw.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/muxomuvakejunufona.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/fedewafilaxenunelixo.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/sepepekujatageno.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/vivux.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/7686c519362bf390c5925522f303fddd/jokekurofizev.pdfIn PDF document text
    • https://lyubomiradineva.com/files/file/72944553995.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/kezufiwilagafemosaxek.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/gigiviraxirosofokudoxi.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/bijukikufulediwuzomo.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132081358076---22539030478.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/pufuzi.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/bebogabaku.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/66074427487.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///26158832698.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/67177632266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=after+dark+games+androidPDF 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_off0000f290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF290 10724 bytes
SHA-256: 12297fa42eed7c556d2d575a0aae3e6bc438b07bb1053bbdca06d63dcba0a429
font_01_sfnt_off00010b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001231d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231D 17400 bytes
SHA-256: 8de069efbeb54041c3de360589f398952f5566add05881be5a750bccddbcfce6

Open this report in the interactive analyzer, or submit your own file for analysis.