Malicious PDF — malware analysis report

Static analysis result for SHA-256 835e3668a78c9c31…

MALICIOUS

PDF

86.0 KB Created: 2021-06-14 11:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a003dc47d3cb5a552a8311afca73674d SHA-1: 55343ce12a9e3b37b0b205e4c1feb02ad2ad6cce SHA-256: 835e3668a78c9c313be21d9decda95d0f3b747927deb510a663a5de2da17def9
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for malware. The embedded URLs, such as 'https://crewmak.ru/uplcv?utm_term=azar+vip+apk', suggest a lure for downloading applications, potentially disguised as legitimate software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crewmak.ru/uplcv?utm_term=azar+vip+apk PDF link annotation
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fea81c0b33---tiditevumitabagapulogema.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609605cfac9e8---94024883596.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/dogozoxepadulum.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16091d2986dd2a---62764612665.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/7543284654ff6a5137b8b774f6b16fcb/nogumiveso.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc734cdd59---23615575489.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b891f6cb119---63967229651.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bad5881acb7---vixuki.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/38df46dcca37baffad99b9c1d2bd0838/87680295440.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c51f7225a---janupiruni.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab344275fb---38998652916.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/13138360556.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/25670992306.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/7452278788.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/85944435858.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/51930773373.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/vekefobesowovop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://mediaget.com/userfiles/files/83273440601.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011dfa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11DFA 19048 bytes
SHA-256: 289bc05c7e1a7ee442ecb50c004bf3f7a68b76815dc5bb43bf1b72b86647c359
font_00_sfnt_off0000e7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E9 4140 bytes
SHA-256: 692fd8399fdd5d7751e2b9575381fba1a9cefd77de17bd0dc41825781f108eec
font_01_sfnt_off0000f5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F6 12472 bytes
SHA-256: 0ea1d80786f5c3d422610baec65c0fb76b19fd8a4406a398ab89fcf348850e24
font_03_sfnt_off00013c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C9E 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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