Malicious PDF — malware analysis report

Static analysis result for SHA-256 fda8521603bdc288…

MALICIOUS

PDF

85.2 KB Created: 2021-08-23 09:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 41b81b21186bc0e88b5b1ff684418fd0 SHA-1: bad817409bcfc0bd7847d38d1b01080be9d64ea8 SHA-256: fda8521603bdc288dd42d6a5029d1eed18d3555794509b1c43a8b668acbfb385
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 an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised WordPress sites. The primary purpose appears to be directing users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://infrive.ru/uplcv?utm_term=react+native+text+input+number+only PDF link annotation
    • https://tortugafilms.ca/adminfiles/file/5784399766.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/58099567160.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210622_EB2A1AD6C204F048.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/418f9d98aca37bf24ce2e9340444da12/67520411730.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/81117962911.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/dinowonujiwuzuliwudekobar.pdfIn PDF document text
    • https://scalper.ir/data/files/file/96624728514.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160f6b42a7a11f---10824548083.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/76377563084.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076e541e0ab9---46173999955.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/5720992612.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd6e692b37---xowigaxibop.pdfIn PDF document text
    • http://www.ezmoving.com/file/wiwezewanufup.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9e07e0aac---jomepudotumuzud.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a914edb96---11015534571.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d3d749cdf16---dogajugulowoxutitufuwisow.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/45026260155.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/gibutesokexisivepatizesu.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f891804744---21331930812.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/9401799813.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_off0000e65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65D 10932 bytes
SHA-256: 7e7ddde3466d1e4358b7b0ae11562bf5f0419a45741c9dd6604540670c0b1e61
font_01_sfnt_off0000ff74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF74 17680 bytes
SHA-256: dcb505959b166a91e7a31f875b031438ae244a6307d299de805db0ea4cecf697
font_02_sfnt_off00012e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1