Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0fe0b28616dde74…

MALICIOUS

PDF

80.2 KB Created: 2021-07-20 03:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5b65563159d3f0865cac267eb2efd27f SHA-1: 0e31b5b4eea24f73621064cdbcd6332b5bc66fb6 SHA-256: c0fe0b28616dde74d2b709adeb077d51dd1d7a975a9acf038f069dd350483bae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests it's designed to lure users into clicking through to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f3c6b58bc---bozagobono.pdf In PDF document text
    • http://unsersohn.ch/images/file/lerelozetokesomura.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/7218c0289d370ea221692c64cf9f47ff/61168574430.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/600a9dd36bda1f3a2a0fa39b0fb17cfa/61913415597.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/fb234aa78b78c7d6f68596645c672127/zadotutarovaduveno.pdfIn PDF document text
    • http://caramelitos.sk/files/73797241545.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/latesufudukema.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/bojoserikimepigabaka.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/20424958100.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/519a2f6952ecc60e834c993275b6479f/69090723331.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/sijujowokudalaxulunaf.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/tezuzegolozevudapawovo.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/c74ff5896eb7f9f69416b1ce179d1ccf/18567946637.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d212a339f6---dumofezagixebaxiwemo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160775207066f4---20262293552.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca25cd8e8d---2613012040.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/jarexiwufakepaluvem.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081fa51d27c5---ditebemovesum.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/81dfd52622470f9d0052ad5864853042/vajagapuxabil.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/ziboxonebebugujuwavos.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080fb62b5d90---69631074275.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/13627535952.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b926b48b1---97980346171.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/xewufutenogob.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aea1ae392e---79326832078.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/zirutuvowexapulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=fabulously+fit+forever+pdfPDF 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_off0000d690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD690 10784 bytes
SHA-256: d08b18b35618df83221b969f2f2d8dd2a486f13ad4ac2d9d078de6eb6cd7956d
font_01_sfnt_off0000ef61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF61 16956 bytes
SHA-256: 057183402983972b43486e4102141150f3bb70fc5851b0db837178020e6ebf5e
font_02_sfnt_off00011b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1