Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f8ef413c45903e…

MALICIOUS

PDF

73.4 KB Created: 2021-10-15 01:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b948b6173e173b3012b7bce41cad03ba SHA-1: 2607eb4ebf932f76a9ead8d83f55c7fcf045ff87 SHA-256: 39f8ef413c45903eab4aad457f97fc20d4c2620b1c2d23ccee04271d4e457981
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The document's structure and URL patterns align with techniques used to distribute malicious payloads or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://teplorium.su/userfiles/file/baroralodazoxezeta.pdf In PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091405454348.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/f44b50f7ca9a05f1f3f4ddf6b870fea5/62932468924.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/54002531361.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/dewinuk.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/siwunabenuma.pdfIn PDF document text
    • http://identik.hu/editor_up/68659294867.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/55401673091.pdfIn PDF document text
    • http://elsped.hu/files/file/zalinozipo.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/5923091845cff4bc07e60a2b9ef32e08/bowotugojabenuturuki.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/fm9c3j44peq7ekb3d5jjvgvld2/zidizutofugaxugivaloxan.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/90659422117.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/17378128135.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/41929183965.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161556ece56e41---wejunizunoto.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f829a729bb---pariduguparozabuxisevazu.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/wepaxeguminofite.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/zelitanidodotunav.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/jetowozoxonumusasikugot.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/36092345669.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/japudekuw.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/93774113868.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/bujasenuseditijexijevokis.pdfIn PDF document text
    • http://orem.mn/uploads/files/8900352329.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/60147345940.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1615bfd8f7daed---zajazixovepagi.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/10223469328.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/xPAns0MRe5M/uplcv?utm_term=word+for+all+in+onePDF 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_off0000bfa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA0 10076 bytes
SHA-256: 56e0bd8752213800cc297f34dc4d31daf1b4a304b6b4d39109855d59251c595b
font_01_sfnt_off0000d614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD614 16564 bytes
SHA-256: 60a78ef35f7b2e36df01291702ce0e67975d65d969963bb88e194dacb5be08ae
font_02_sfnt_off0000ffbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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