Malicious PDF — malware analysis report

Static analysis result for SHA-256 516476ecef667b6a…

MALICIOUS

PDF

85.0 KB Created: 2021-06-25 23:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4be37de5615c74682b8f9e9fb1fd4a81 SHA-1: 2b255473d61ce8d9f60a54687ba658a0d562a693 SHA-256: 516476ecef667b6af7e4add86fcc99e305a84661b6ddb712eb3b8d5a92f7af66
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed for phishing or malware distribution. The presence of a 'visual download button' heuristic further supports the intent to trick users into clicking malicious links. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=how+to+hook+up+chromecast+to+new+wifi
    • http://perlawarmii.pl/userfiles/file/48600425347.pdf
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/77059026074.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609830b5c4a8c---vusowepomaposo.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b5feadaff95---romaji.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086613abe165---dadegonedegat.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad829ce1bb0---bafizadasi.pdf
    • http://tasarimak.com/ckfinder/userfiles/files/11557864742.pdf
    • http://www.findvoters.com/userfiles/file/77296990372.pdf
    • http://andrelandberg.com/userfiles/file/97248436575.pdf
    • http://pspectr.ru/userfiles/file/mugujako.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c09b2b2254f---vemuvil.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/4902f617d253ecf42c78c0dca26abec7/20114984848.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-5-22/20210522235625245508.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821e8fa4bc8---lemot.pdf
    • http://thaiboxes.com/piceditor/file/xexowewelop.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8e80b363f01cf8e9380e7e44732f5ce9/menovog.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2fe487194---86799542680.pdf
    • http://hvpeds.com/upload/contents/file/98895234067.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/u9ek12krgtdhkthi8pr7ib3gl0/lapeximakagenu.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/92596879174.pdf
    • http://pathakpharma.in/singhania/downloads/file/48162649929.pdf
    • http://yogo110.com/userfiles/file/tegefawanabuxiwivopafafim.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/00abd6e7d0bf7bf23e420b9abb9297fd/64292395182.pdf
    • http://moestuinwebshop.nl/userfiles/file/kivuviw.pdf
    • http://baovephuongtroi.com/vietkiendo/upload/file/xikisuso.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e848.bin
a1327b61cd7ac75fdf11693e62f551f092d8b9a0a175c138eb65c700cf83b452
pdf-font-stream PDF embedded font (sfnt) at offset 0xE848 10968 bytes
font_01_sfnt_off0001019c.bin
f7494d08aedf0a28612c98a21f7978bab48bd106eb6dd065c102b5349f9fc4b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1019C 17124 bytes
font_02_sfnt_off00012e83.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E83 16792 bytes