Malicious PDF — malware analysis report

Static analysis result for SHA-256 769971ef25180678…

MALICIOUS

PDF

72.3 KB Created: 2021-06-27 21:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: acbeb59fbf90eb6eeac13c10c0624880 SHA-1: 9977a1cbc3279a91b670202cdc208c7baf6b7f61 SHA-256: 769971ef2518067872703c32315ec73c9fbcb96e2dccb8f3728a932badfd2f35
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous external URLs are embedded, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded content, though heavily obfuscated, are consistent with exploit delivery or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://garglob.ru/uplcv?utm_term=words+containing+o PDF link annotation
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/211e48aa2adfc58bd21f215d058917da/56492605416.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/siwofiduxotokax.pdfIn PDF document text
    • http://renknh.com/ckupload/files/podonuxovamuzutanosim.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/neginoduvo.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160beddfe0e982---vofebosiv.pdfIn PDF document text
    • https://angkalaris.com/contents//files/gatesopet.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e98b90a92---20037107097.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/xazoxanajejum.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/5d83958c8c0e6e10e52380bf6220bb78/dipajafafijiv.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/78215532588.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc0ca3295f---94565022537.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e14bfb827a---xarelozew.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160baa799ba938---jifamapimorurasemi.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/an1q2gingg0cpep9h0eulubkq9/22481402992.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f92805d734---56014080028.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/kepomojobevob.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/21326039835.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4a04d0761---12628243403.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a105804ab---fuwoboxif.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/b5d978ad79642b4c8dc6a024a51653e3/mifoxokuxajanumi.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/zedotu.pdfIn PDF document text
    • http://dgjst.com/upfile/file/46716982217.pdfIn PDF document text
    • http://smiletoursvietnam.com/ckfinder/userfiles/files/zejagiker.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/96e2c6755122939b9fc8a98f9f2f3441/48269564822.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a58ccdad84---14949975792.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608511aa040c3---73715744730.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_off0000bbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C3 10360 bytes
SHA-256: 7b54bf5256ce1b490603d24a5602261abdd21c14b664e23249cd232e5ee8f886
font_02_sfnt_off0000eb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB14 16004 bytes
SHA-256: 3863592b941dd86b68b9f5d6c92bfd29ed973a4c78384731faff257c9a34a56a

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