Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6e4533e120fe4fd…

MALICIOUS

PDF

76.6 KB Created: 2021-09-05 16:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dc65821fadcb4542c21901b36ba3a007 SHA-1: a6b9072d0b1f1d1f333cd5e4714fb03c718e275d SHA-256: b6e4533e120fe4fdc39d97819c844407b9be94d885334bdd7fe45dee270e3d3c
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple websites, some of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://curry-box-deluxe.de/userfiles/file/poxajidimukozigir.pdf In PDF document text
    • https://osikovo.eu/webroot/img/content/files/kakenojujelosak.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/sagegolidijiri.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/14614702091.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/34499961078.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/855acfa2ff631567e938ed2a4e2a5eb2/21536015141.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/48756236131.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210515184216392.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/surepoxeremojuzubedu.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/netenazuxifaxif.pdfIn PDF document text
    • http://soles2walk.cz/data/file/78663374700.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/fepedolaf.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/df967898d63f80a564d423ed8dfec8eb/24778985703.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/42252711105.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cb72855a3---feban.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad2582f2b2---63119094404.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/hattjgtfk1k1tras5t51bimfnq/1956556584.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/velikulufigedutuz.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/dpvmn1j7tsj70odn3u355vjgk5/tozuw.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/sorilovadekatexosa.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ca228f98d---84779461434.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/27599194216.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83a009ae93---mowabejukosar.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/od9f2ale9d01vg7busqttnj9e6/30486287990.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=viesa+master+manualPDF 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_off0000c8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F0 10216 bytes
SHA-256: 77a1b894f78d6dfba68c54ab8a00338b7ec0ed848b0201b2ba2a50b18b140d94
font_01_sfnt_off0000dfd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD6 17220 bytes
SHA-256: 6e3f02b32aa9bad224caf0647e2d96c2eac10a3c42668d02903f55e1c70d46c7
font_02_sfnt_off00010bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1