Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb63d4e7e304d0ab…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 00:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f3a024782da0ba96f5039382ca82ac3f SHA-1: 86bec8bd998955a88711f4b40bc838b608d9f7c8 SHA-256: fb63d4e7e304d0aba863ac9a351a0b38dae82e53b8bde485526d8f1e79ddfb87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The presence of UTM parameters in one URL indicates an effort to track user interactions. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://synerhu.ru/uplcv?utm_term=lulubox+pro+apk+download+for+android PDF link annotation
    • http://makassitools.com/userfiles/file///pudinobabufanif.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/sunakoximaxevuw.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/xokite.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d026a8b36---pojakibe.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/suguzalagexa.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/22059571478.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613394a27b858---48469393118.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109071004301781.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/9ee02d72bec0a1cc5b33689d6cf2ff1f/96128282431.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/3500251328.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/kapun.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/38190065604.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/zegobubabevax.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/53154445311.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/49269407345.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/kovafikusulijetokizon.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/berawudamexase.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/videjaroxewaki.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/52767124534.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/rujunaladivowi.pdfIn PDF document text
    • https://scalper.ir/data/files/file/xobokekafedu.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/kiduvapelasag.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_off0000d1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DD 18080 bytes
SHA-256: 7c1c04bd983d5b4fc8e8e4e51a38f78fe53b51a9222c7c84b84cdd792fe42052
font_01_sfnt_off0001006e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006E 10568 bytes
SHA-256: 459599d259cfb81e33a0f5d2697e6e3cfa4f713ed365c19baf63fb7ed64a963f
font_02_sfnt_off00011865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11865 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1