Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da040aa67d8e4a3…

MALICIOUS

PDF

92.0 KB Created: 2021-07-31 08:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cae2843796a64e8b70849cbca6ce6fbc SHA-1: 98a0acd7fda0f51d9193d164217f1c475201f206 SHA-256: 6da040aa67d8e4a32a2fd47c9b4c6c334a0cb0e18dd3b3f204b703629cb5be49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS uploads. The presence of multiple external URIs and a link farm structure suggests an attempt to redirect users to potentially malicious sites or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://principesgs.com/userfiles/file/filitevemaleter.pdf In PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d19c4c604e---zitorurilobujuwofi.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c865800650---35906631956.pdfIn PDF document text
    • http://coumert.com/images/file/65268140980.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/ridaviwudizukefud.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd3ed37bfe---rimepixojuzobofinotapuwib.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/49645191893.pdfIn PDF document text
    • http://nebo52.ru/uploads/files/sotikab.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8667089f6---41698461093.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/56731360682.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/74e787073c26fccd4614c69ca8b083c5/baxivumojimobudidalozi.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/rakepewudevitigu.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/wulikoniv.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/34b4ab6717cb053ec0ebdad04b29d096/pagozikitibed.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/gapesozubivaruxujuxur.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077561c510e7---zoxinoneguvamodowiroviduw.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b0966f4d32a---nazatinobolinawiboki.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/d855g6ma4agvdl4mg05if95l4h/47866118004.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/nupeziwikafifi.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb1f178597---86062070561.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/1b69fc76aad53f624aeb321f15dbc0f2/darajugina.pdfIn PDF document text
    • https://nasikampung.info/contents//files/55326525246.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=estructura+de+lewis+del+compuesto+ccl4PDF 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_off0000fd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11521 19304 bytes
SHA-256: 0eb406449eef33ae0cb360ce53bf50f1e4170188672af9f4adcf015d426e3088
font_02_sfnt_off00014723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14723 10820 bytes
SHA-256: 063f4edeb9871b47d3bc095ea3d1ebd94e5fb5f38c50ff4bf211d068822d8714

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