Malicious PDF — malware analysis report

Static analysis result for SHA-256 f633adaf70f7ee78…

MALICIOUS

PDF

69.8 KB Created: 2021-10-04 05:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d1b04e01a9e318225b630e36385bacb3 SHA-1: 6d6bf0265d63e0fcefb8a719299142a1bcea6d3e SHA-256: f633adaf70f7ee7848b6c4a69223d6bf2c0389d24bd29686c77969af1e98cbae
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of numerous external links strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://krisoc.ru/uplcv?utm_term=mating+in+snakes PDF link annotation
    • https://showerdrainplus.com/uploads/files/202109271302355565.pdfIn PDF document text
    • http://pedraferro.com/files/files/zekifinuzekodagi.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/90586269996.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/36341363821.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/41428681130.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/piximorexerinefamapobofog.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/jaxilibenewaje.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/kixazibinebigit.pdfIn PDF document text
    • https://rtaadmin.mrv-educationservices.com/content_file/files/13374784469.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/6585496499.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/sopasivededosapibetorore.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/78131279445.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/bitogoze.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613aca470912d---6074984509.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320c90a0a7f---41898076313.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/japademoka.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/40126972183.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/37040435787.pdfIn PDF document text
    • https://successalpha.team/upload/files/91086121078.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/77666475847.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7e2f33ff5---bevirosuletarebu.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/30876765188.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/romexamuselizolodaxebel.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/54782341474.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/40577547989.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/57145897898.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/55192320685.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_off0000b547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB547 14860 bytes
SHA-256: c477822c95e11fbe8a2616ea2424f70eca8f1c8033afdceef2b25a169b476835
font_01_sfnt_off0000dab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB0 10100 bytes
SHA-256: 95ddf989fb929995f0e1e570bcb5b077c44bf42d8a3faa7d43e45dfa644c11c3
font_02_sfnt_off0000f15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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