Malicious PDF — malware analysis report

Static analysis result for SHA-256 a65d2f65194006d7…

MALICIOUS

PDF

69.9 KB Created: 2021-09-10 10:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0e434f74df679beef507cccb0182f614 SHA-1: f73cc01aea2783e1b69cc60c286d47a296879936 SHA-256: a65d2f65194006d7a1c3c64c8eff2878f7148746a7919dbf897ad6d9a405c15a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs that form a link farm, with many pointing to disposable hosting or compromised CMS upload directories. The primary function appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=tumile+video+call PDF link annotation
    • http://queensparkview.com/image/upload/File/99057227622.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/vepawobufodosemetikiles.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/tesegonafugokakuvekivivog.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/210901095220307635cnxps0.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/84307212381.pdfIn PDF document text
    • http://potlista.com/file/files/62662395141.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/38429978024.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161374c99a1b3f---58175504723.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109092054031935.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/33400207142.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/53995313064.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/80861203738.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/15745997202.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/fokedakududup.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/3866a2c1d9a47614954c375e97f79e06/mujiwomi.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/95523821850.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c922c0183---88294396195.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161325ca739858---80621533958.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/85439741637.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/dozixalidixa.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210901152646.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/netemomulumoza.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_off0000b1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FD 10188 bytes
SHA-256: 73b90ee8d4a901862a60159e10e51dbe04edbbfa7944758aa988f3f165e13873
font_01_sfnt_off0000c8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C9 15796 bytes
SHA-256: 3fcf32b5f31943e0e45e13bb65564533ccbc3e7d5337650c1d5f48507b4ed36d
font_02_sfnt_off0000f0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1