Malicious PDF — malware analysis report

Static analysis result for SHA-256 d692f84942d47a88…

MALICIOUS

PDF

75.9 KB Created: 2021-08-22 21:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0c6cd573ce83a43e91bb27366d43d943 SHA-1: 8e98b41d1f90ae315b6eeb2cbba08052c1ca8c83 SHA-256: d692f84942d47a887b84285e5291e072335ec02d116b5c7535d28c6d9a21d8ca
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. The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with the 'Pdf.Phishing.Trojan' detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/85fe9ef19a8d28f3be15dd7858ca8bac/14811551125.pdf In PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/70cb71bc0d233c878ccd050572785f87/50603587314.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce9a2570c3---86750485048.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/vonigiraji.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/55005632348.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/iql58ssgjggmngm4v0tnh5ojn5/xejikamidon.pdfIn PDF document text
    • http://dothi.info/images/files/sexavudorejuvipumapixaxed.pdfIn PDF document text
    • http://suncreekpuppies.com/clients/8/88/88daaab1104cc9784d9cd8b59d189b35/File/fizuleziwor.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/e1a9f8ce569f4453d314875fb8208ff3/jikapikipojumafeju.pdfIn PDF document text
    • http://thedreams.cz/files/nipanuwilopevir.pdfIn PDF document text
    • http://giga.sk/storage/file/75723033625.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/80591169240.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/mewanasepofuwesinov.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/basakemulenedusilede.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/dowamadosumimefu.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa004b383d0---6061980245.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/vipajigowulubigot.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/8937d0adc731d5f7c0208c05a9e86ea1/95914670469.pdfIn PDF document text
    • http://scro.ru/pic/file/10996683657.pdfIn PDF document text
    • http://bienbao.net/uploads/files/63507360337.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/zijowanelixoranabepogined.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083c038983d3---11506789698.pdfIn PDF document text
    • http://elitvorota.ru/f/file/4470729610.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ferdi+tayfur+filmi+izle+fullPDF 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_off0000c424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC424 10372 bytes
SHA-256: 362080bfdfd7cbef0b3e65ccb540fb1671d256d572e6b3e459f3dcb6b71be41a
font_01_sfnt_off0000db9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9B 17764 bytes
SHA-256: 0674b0bc72a5c22e8a8e59b504ac7b558f29e2607531522e00ec4aa515a0b0de
font_02_sfnt_off00010719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10719 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1