Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f2f09bb07ef505…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 15:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f9e78a7d1cbc89927c81b062b7cc424e SHA-1: d5654f2f9ddf18e592f9bf5d830c871d5ba33366 SHA-256: d3f2f09bb07ef505e9305dd20d9765150b3d6545e044cb6043ee4117ae8ff014
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to multiple disposable hosts and compromised CMS uploads, with embedded URLs like 'https://pixomot.ru/uplcv?utm_term=how+to+draw+a+puppy'. The document body is heavily obfuscated, but the overall structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://pixomot.ru/uplcv?utm_term=how+to+draw+a+puppy PDF link annotation
    • http://bitite.lv/media/txt/122/file/bikixawiwirakinekudur.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/valabofolovamijuloxur.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/ribujo.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/xulabiluf.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/wewamelawudifafe.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/91162233536.pdfIn PDF document text
    • http://superazs.ru/images/news/file/beligow.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/woxasesuwir.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/69693403628.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133bf8638bdc---48148007927.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/papuzojirudozozuduna.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/wolominuvis.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffbc446661---gepamemuka.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/56294762690.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0bf60d549---duzenajamumijizodag.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/pinewibozosivimo.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/84051431813.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-12/20210912152741902985.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/famivolaraniwoxamizuvu.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/64009449384.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/zifiju.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/lipurerewunaju.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/92669865196.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/vimuzuxesavijaforetilaru.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/71632886992.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_off0000ddbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBC 10136 bytes
SHA-256: 67205d5a71cfdaced7dd44b28bc1d6a00c17b27f657afe8bbcb66a584f4a205c
font_01_sfnt_off0000f47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8C 17444 bytes
SHA-256: 1636a2abe30a1c31c3b5a31ad3610c6c1fa5593daa10058b21d62f507149a2cb

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