Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9ae0f44b520afcf…

MALICIOUS

PDF

89.7 KB Created: 2021-09-09 22:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7da47b4876006155c90e6597923860c3 SHA-1: a511cd01babaf27c944044fb4aed2da20a17f9f4 SHA-256: d9ae0f44b520afcf27721cbbb3a8e078f45fead4707fc125112cc55954efe369
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various domains, many of which are associated with link farms and potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://infrive.ru/uplcv?utm_term=broken+android+data+recovery+app PDF link annotation
    • http://xedaphcm.com/luutru/files/96017470334.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/87679823567.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/36804037322.pdfIn PDF document text
    • https://clubon.top/uploads/files/sitodiguzokalikuvip.pdfIn PDF document text
    • https://fishboat.hr/files/fewogidub.pdfIn PDF document text
    • http://sjanzee.nl/file/wuzagekosazi.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/8563081366.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e53f96578---nudakurexikudofizepemut.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/13012146207.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/98698109885.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/kuwisozivari.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/mobega.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/84227074060.pdfIn PDF document text
    • https://cityface.cz/res/file/12586804163.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/1098233584.pdfIn PDF document text
    • http://candientuvibra.com/images/file/mudakezakatimisow.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/88965160092.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/61269982315.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613337b5290f7---felozokuvorow.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613289503b9ee---76129783506.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/81001945183.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/jojuxulej.pdfIn PDF document text
    • https://dalba.net/other_files/File/juteme.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/7756269168.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16138da941b684---85845335766.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/galalebogiv.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_off0000f5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B8 19456 bytes
SHA-256: 543c7314c252d0e9d4f522fe45af37d2c49d1390600acbabf32cc519f1fdcc4c
font_01_sfnt_off0001281b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14032 10620 bytes
SHA-256: 5def243f534d24f88ddcd33d308b0c1b48a924bb540253cda923a0116644e80c

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