Malicious PDF — malware analysis report

Static analysis result for SHA-256 70720652db86a9e9…

MALICIOUS

PDF

101.1 KB Created: 2021-07-13 07:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6fc8c781599f9df4d4833f9669b15d28 SHA-1: 46d05fccdf2a9365af93d7c1f6507ab361c3815e SHA-256: 70720652db86a9e98c4cd65e269a616c8fb8674ab425f5420608bf7134f112d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure suggest it's intended to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ketchas.ru/uplcv?utm_term=what+a+wonderful+name+it+is PDF link annotation
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/cf0effd6ff6437614f7203acb8f21b95/gipuminozolenunavip.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/povesexuxopozalurage.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/197331472660bba7a84f033.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b768a6da66f---95080034440.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/90788890768.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/96470083432.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/24232329606.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b802060b39f---pexerotukijufemofudef.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/ruzobidosokisubofol.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160837447da034---kalumarawuxaduwenedopudu.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/63403199216.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/17222690471.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/25261930021.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/vosekotog.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/1b70013cf4d1fecb75f5e34b1f96d02d/duweturedumowowewomazu.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/0f1s6t2akmjf33ck5krsn09drp/50579777432.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/18859208901.pdfIn PDF document text
    • https://pmms-online.com/assets/file/51500377307.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079055ea8995---36088065370.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607daaf4d96ed---16710866531.pdfIn PDF document text
    • http://womenscouncildallasarboretum.org/clients/85748/File/56421486287.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/fibawimenimubit.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/8b44eb184846a12d92cde234d520023b/vakufakigonafagulamebi.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_off000126b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B7 18244 bytes
SHA-256: d648271de5c2f0e7febd539af28dbf4a132575230bcea8ef441fdb97e4e62ae1
font_01_sfnt_off0001569a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1569A 10800 bytes
SHA-256: f86efd85cb26b4f72e79f510c93378d98b8c968e06fc083fbe6f5f25b29ff9f5
font_02_sfnt_off00016f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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