Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6148efdcdb392b…

MALICIOUS

PDF

107.4 KB Created: 2021-08-05 14:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8d044c8e81e6d79fa10c8cfc882d08a9 SHA-1: dde8e5af4c2689b98c7faa0b4fdccc7972b5373d SHA-256: ef6148efdcdb392bb25cf0b3eb558b4036f9e44dbdd4218a1d914ca77f7f9682
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's purpose is to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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 http://bendhorseride.com/userfiles/file/rogova.pdf In PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/b927c7a3a2a6aa98a45e3e4c4763d731/48599759644.pdfIn PDF document text
    • http://splogservice.ru/content/file/83849957009.pdfIn PDF document text
    • https://j26clean.com/upload/files/35292041745.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/60824499003.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/7ba0552e4868165225a0106e64eabaf4/mufulujuruk.pdfIn PDF document text
    • https://j26clean.com/upload/files/62582215780.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6644a11d4---jenizan.pdfIn PDF document text
    • https://vietspices.asia/uploads/files/55228583948.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d40ba72ac54---befagujiso.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/lupevobamajijapa.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/3c5dc11a7e11c1e6d3beaf85a9d70ad3/xabozupekunoxunat.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/fenixogunesuxibabulubela.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/ci7gut82l338dpuhskmnbperch/26030138267.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f02d8707bc7---mepelokusegegizojusu.pdfIn PDF document text
    • http://clarasonic.com/upload/file/42691132382.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/tudalipevalarukaf.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/bikek.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf759423b84---79524393533.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/fodixetenafojak.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/17813039920.pdfIn PDF document text
    • https://latework.cz/soubory/xosiwus.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16084cd622fe6c---fefavimogulo.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/45163261000.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ab037907a---84321275848.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/63608505406.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=goethe+teoria+del+color+libro+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_off00013978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13978 21016 bytes
SHA-256: f9822eb80e7e5c941ff669368259c459dabd51dcdedf51366bf89d1d52bb437f
font_01_sfnt_off00016e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E50 10624 bytes
SHA-256: af3677781bbe857436e0505127cc1392a00cebe2a97f2327f9cbffc8a07e965f
font_02_sfnt_off0001867c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1867C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1