Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1dcd7250c782246…

MALICIOUS

PDF

81.8 KB Created: 2021-09-12 13:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: d7956b7aecddfe89554a3f06e4cb28fd SHA-1: 80fe6f9d56fc28878e387b6ee9bc149dcd7cac61 SHA-256: c1dcd7250c782246b3ac43e49bc71773e315c27f5e97f8ba8d27409c4510b142
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a lure document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://denis-lefebvre-services.com/fichiers/file/parosifibom.pdf In PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/tirozuruwapalaku.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1631318197.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/29944424388.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/29516162069.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/3646803898.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/a28ae8f33ec597f8e72099e90a091292.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/gefenanomoziz.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/mozokimesagusuritejabebom.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137951ea3dcb---vijusagedem.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff8e9a4da1---81415900157.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/161300460c9af7---fedarew.pdfIn PDF document text
    • http://taigesw.com/upload/files/22750899289.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/kopitisotowiwo.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/bekefaz.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/xasijewogof.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b2ce7301a---96455273270.pdfIn PDF document text
    • http://machin.kr/userData/board/file/64574855350.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/gujivubipemoxikelabefeso.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109031554228158.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/dakopasinakomixekapovu.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a4ca58755---fopanidelitikozetiwufo.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/jupulubaxazo.pdfIn PDF document text
    • http://skrn.cz/pic/file/vilazoza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=apk+mod+gta+san+andreas+1.08PDF 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_off0000d2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B5 11116 bytes
SHA-256: b075a1cc19569cda7771d787930aee09ec080b3936259ca8ed0949ff46ae5427
font_01_sfnt_off0000ec89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC89 20396 bytes
SHA-256: fedc9db5ae68df27e187f12c3a1398037c82bf984c4142a217422c7007bed506
font_02_sfnt_off000121f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1