Malicious PDF — malware analysis report

Static analysis result for SHA-256 f86b7b52593f0790…

MALICIOUS

PDF

82.9 KB Created: 2021-09-21 08:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 07d342a3724a777c9e7f37edb5f6fa13 SHA-1: efd87d00407d90784de6a56e2856da2bac3e8d7e SHA-256: f86b7b52593f079061ca6fd2461926fa9ea3feaadf53b47da7cf6150d20e308e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains numerous links to compromised websites and disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a 'download' button heuristic further supports this, indicating a lure to download a malicious payload disguised as a legitimate file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=it+2+telugu+dubbed+movie+download PDF link annotation
    • http://tantex.org/tantex/tantexuserfiles/file/57512189540.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/0c41571e537e649295ae33afef682279/86465169285.pdfIn PDF document text
    • http://giaphatmed.com/upload/file/lolosapifupijimimaj.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/35022661741.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/8aa2d786e8721c86435e740808abd8d6/zafabudo.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/mimaronatajuviz.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/11441758159.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/pabudo.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/bemawuxamudefedekigubavub.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/fekipojosoworasujoma.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/57863581925.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/86313319125.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/jixutagoxisabuvunakesovot.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/dekujegojibojemamikijepap.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/44f9eb8a6031f5f11eb3a4abfe8698f8/87955820290.pdfIn PDF document text
    • http://c-six.it/userfiles/files/jogunubozupurisubamo.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/9019408621.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/gexakilulijekoloneb.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/48052696114.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/numizesopusixa.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/85316230845.pdfIn PDF document text
    • https://lorus.rs/files/47942136486.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_off0000dfae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAE 18024 bytes
SHA-256: 0f3c62bb1910502544a0c7fdf6564b214dccc280bff34327927ece2254dca761
font_01_sfnt_off00010d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12564 10788 bytes
SHA-256: 7001a9a8ed27345740ffcb8c1147348d4d9a97549a9518f5454c0839aa99fe51

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