Malicious PDF — malware analysis report

Static analysis result for SHA-256 b49565b1b86bb54e…

MALICIOUS

PDF

81.1 KB Created: 2021-07-30 15:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f25a1c4bcf69e2c502c9e2e5ad25f5aa SHA-1: e7557fdfa3467600f793fe68bccec8ba717427f5 SHA-256: b49565b1b86bb54e10429f867e312937ff98c01538a139df4d6d3330ae47e08d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and a high number of links per host further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 http://ridendo.cz/files/file/11082550198.pdf In PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/gakunukikiribi.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/99160169356.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/4dof786ntstgtvb35fngsmic90/2559804421.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/bilopuzeta.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/binaxakusosovekozugof.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/dinukevegiruxakad.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac0926f717---87845738202.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7e0439d7c---togeseriwinezurigopunopez.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/99c0610b232c76c899efc64588b8d319/popupaxupijajejan.pdfIn PDF document text
    • http://walkandwagforveterans.com/clients/9/96/96cc06f6b2a5429c1325f0b535cddba6/File/kuros.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/vupawunukotatoveradifi.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855618303d6---98885702169.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/vukipivawunezebexi.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/39882732900.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/vsmpv6nnp0d0gj3plqid3k0f5u/89212843735.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/mulevo.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/sjlvarhl6guj1ijdrl1dusci31/23347344592.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c6bbb19b1---82247099926.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/40900543667.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/bakitivenisaxo.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/77847065884.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16096668a10e0e---rigoxefiperinolax.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/61921667022.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076521bc6dae---pawajevedititufujijis.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/14785418925.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d7f3c20ff---vivopozuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=program+directv+remote+to+control+samsung+tvPDF 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_off0000dac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D5 16224 bytes
SHA-256: 8a68dc0afe0b0fb3ae340c0265f5d401fc03ace3b3e2a6b1f912cc26a1c7f55c
font_02_sfnt_off00011cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD0 10880 bytes
SHA-256: c529dcddf86f30a67af19f04d7b9e049687f1db9bb3369c0d8fc6d4e2c420923

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