Malicious PDF — malware analysis report

Static analysis result for SHA-256 34562f39d75f0f8d…

MALICIOUS

PDF

108.2 KB Created: 2021-07-14 01:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5f1f72dfd3f05d683d44d77015821de5 SHA-1: e7394147eefa0da19efcdd4a1480873df57b18cc SHA-256: 34562f39d75f0f8d05c1187f3e667b49b8c239fe27df86cee625ccf163ce32d1
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking clear user-facing content but containing structural elements indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://majorsagilekvaros.hu/uploads/file/10884555165.pdf In PDF document text
    • http://jshtextile.com/UserFiles/file///87319920066.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/15b21b35f0c644e0a6dfbd9f2e0c9d42/zaxizilafakebuvonig.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/49i4hi1h324ir4nlqqpqrv083q/98949482060.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/7229471409.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/vibuxedabudinejidenuvuto.pdfIn PDF document text
    • http://ural-kip.ru/admin/ckfinder/userfiles/files/80017061765.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/34769622640.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b262b978b77---volalimoma.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/1ce65c1d37c37eb22769a5ca31931629/3952103891.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/binumuxupidubejo.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/a8ed648f4710a0aeea0cde64ea7c8814/jupolumosimujesijemikil.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/80420036346.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/juxewas.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/1eba84828efed94634a4992727b48f6e/jilusudemomutuxikunipof.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/36770189688.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/lobil.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/b9fa1b6d4e7793c7b40b7b9d4db59f55/58464250750.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/v6idjgj8a5o9o6u0qaeja5nfm3/nolotigebegebirenofesedot.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/votidepifusekarozix.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210624113528.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/e2898fdd93969d6ac9560cd36bdfeb0d/88151499542.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/65028688642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=continuity+equation+for+3+dimensional+flowPDF 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_off00013c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15447 20124 bytes
SHA-256: 0625810c1dfa7791b409ec79256d49a3b1074c92fb46063baa4efff3475bf87b
font_02_sfnt_off0001899e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1899E 11164 bytes
SHA-256: 2a309164994011d1679ec90b0c1998d17f40a4fd98304c96849d62aeb6f9d32b