Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a802e47f5ad223b…

MALICIOUS

PDF

81.8 KB Created: 2021-09-21 04:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c92d181df5e0d4c1962f1f2e2db19200 SHA-1: 02b3051d0877c14ce6d2644f243e681737dba80b SHA-256: 7a802e47f5ad223b7185d34c169916dc75ffdd5747fc7fc517a4deeadc88a56f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to create a deceptive web presence. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=android+sms+tone PDF link annotation
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140cbf23cf1f---10228773577.pdfIn PDF document text
    • http://m2m2design.com/userfiles/xavekadiwufijo.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210903120233_gdgvm8.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/99594569820.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/dupufiv.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/45516481027.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/kapaxin.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/97053991575.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/85237886433.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/wonumazugikomiveji.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321b93b3696---75731615262.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/78825139700.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/39153028839.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/vofekenidorutebupov.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/kalosomizejodajimul.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/ronawivarefalije.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/54183243949.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/91089571307.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81561600133.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/19ed7a8182eef2346ebd5868604f3c52/37219271310.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/44881768914.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/76827678837.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/45919f8e13cf6329160e1c0340c74507/8719534467.pdfIn PDF document text
    • https://jotelek.hu/files/file/tewazuxekomod.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_off0000dc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1F 10184 bytes
SHA-256: 8f76327746d63c66af3b817ba38dfa7b111ed6f93e61a3118c731e3519b0d738
font_01_sfnt_off0000f2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFE 18160 bytes
SHA-256: ff97c031e395eabaf2ad7557df41643122e591785886ac510bc6fb2cb7244090

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