Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2fffc41f165eef2…

MALICIOUS

PDF

73.7 KB Created: 2021-09-27 01:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f6419991f7f66028b38a2f3e5f2f52ba SHA-1: 8c88e989e03f99f679e489b93c0520ac7897c196 SHA-256: b2fffc41f165eef25938346ac715c4de39d07b9bca069b406073f09079c3b791
96 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, and heuristics identified the PDF as a link farm pointing to multiple distinct hosts, some of which appear to be compromised CMS uploads. The document's structure and embedded URLs suggest an attempt to lure users to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • 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://ih-consultant.com/ckfinder/userfiles/files/tudidirovagiji.pdf In PDF document text
    • https://conviviodihera.it/dati/upload/file/fazenugamobefup.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/43909406823.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/78521168879.pdfIn PDF document text
    • http://cmi.nfe.go.th/ckfinder/userfiles/files/74374083072.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/nutosinalatifipimivebam.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/4704d391fd6ca8445d6dece4550f6276/luladasetonosogel.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/zurimojuboxefekijowov.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/xadezivavexaninazuleke.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f354633138---zixuliwenunaripugoz.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/34192598644.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/samemolute.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/24852802025.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/53274526951.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd576506b6---57912212788.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/nofefitox.pdfIn PDF document text
    • http://smirna.pl/files/file/53011005483.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/70211917466.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/zaliwijedefuviguwuvadu.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/valirar.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/86035984081.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/vowifojaxetexabivuveki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=gangstar+vegas+system+requirementsPDF 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_off0000ba13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA13 10752 bytes
SHA-256: 83ae3d16f60f185eb0c3fe7bceb516524d56fc6bd3c68ee273652ee21a707d13
font_01_sfnt_off0000d28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28A 17980 bytes
SHA-256: 7265b3ac5f1f3f394e00eaef2c8d738ac9023007b63d1635dd9eba4c1d8a74fd
font_02_sfnt_off00010155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10155 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1