Malicious PDF — malware analysis report

Static analysis result for SHA-256 56896cad8b335937…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 17:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d3f483189a0c8c3def9bfb991097163d SHA-1: 73dba4ede3ccfb7f138c00b8b4511d99eb93fc31 SHA-256: 56896cad8b3359379b5dada25f9930c9449268c37468275df75017fb2620e778
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress sites and disposable hosting. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=skam+spain+episode+1+eng+sub PDF link annotation
    • http://dongzzang.com/userfiles/file///74490435323.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/vuzozerorogogorepaja.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/koxiwobubup.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/iktsbfgcs2jhome1e74i8h6qv5/videxoxudevonedutap.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/fupewubud.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/26519385432.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/gazibexabutabomu.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/puxaniwalux.pdfIn PDF document text
    • https://tekartltd.com/upload/files/tajukubir.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/baxufofotinejogibeketak.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/sipuga.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/14494690333.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/jireborinigiziliwesukamog.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/57535887042.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/b5fbe8abb556f1988d1adc515e18c739/kuzomerugi.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/penobujewawej.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/takomuwa.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/fevuvifexorowifatagozik.pdfIn PDF document text
    • http://tzsunup.com/upload/tuwotijawuvedowego.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/2247115200.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/44025565847.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/nowumu.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/1804532431e62a73ac6982cf3d3eab09/51695779454.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613817d2b0c2b---72989019083.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_off0000d851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD851 19896 bytes
SHA-256: d950e5d6ea7eba0d71c78b844ad94a40a841611a9dfdb30597c30b66ee157c3b
font_01_sfnt_off00010c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C93 10948 bytes
SHA-256: f33cd37e8f0a3a6447803ca50200e391f983411b60c8dfcd8064c2a58cb1f06b
font_02_sfnt_off00012586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12586 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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