Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b89d65ad7985597…

MALICIOUS

PDF

70.0 KB Created: 2021-09-20 08:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9d9e27e29cac71ec696a4252696ab5ae SHA-1: 95966893109b944e554b0d2f4ab3527950f476b7 SHA-256: 2b89d65ad798559791fe6f5314f3bd3553e16717a6687e3810108f580ba84f00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to obscure the final destination. The primary URL, 'https://inwebjor.ru/uplcv?utm_term=login+to+365+portal', strongly indicates a phishing attempt targeting Microsoft 365 credentials. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inwebjor.ru/uplcv?utm_term=login+to+365+portal PDF link annotation
    • http://primaria-ciocirlia.ro/media/file/97385403845.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613616cbea773---tanuxama.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/sitewaliwu.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145a5b81bf5c---3822306987.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/pebumad.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/jakobos.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ce62ab9f3---pusojuveketasutaxa.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/8149642144.pdfIn PDF document text
    • http://eko-uklid.com/files/file/wejod.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/b4e6a114dd74085f47d7a751f746344f/fogufaduwosadutor.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/rapepi.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/25553717944.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/93422427046.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210920020349.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/runewuzusalipu.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146759eac3a0---suzofe.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/wusubijibujarinamubute.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/livinuvipunawijerujim.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/77287465015.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/89977906124.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/76962134743.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/kudez.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/44727356220.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_off0000b208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB208 15928 bytes
SHA-256: 94f069cd3883bddf98b7634c5b4a93cb494d5c2ec164fb2936420f568c798247
font_01_sfnt_off0000dae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FC 10556 bytes
SHA-256: e2ae4a924fe41281dbea96529cfb2c68805fae91b550a833c807086653dcee53

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