Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a121413b874a28…

MALICIOUS

PDF

86.4 KB Created: 2021-07-04 22:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c3b8ea8bc158a6bc52e81d92c4b3508e SHA-1: f1780e80d3e47567c4528255f77b717766aafc23 SHA-256: 13a121413b874a28e941ee5aa81eb544d903b60a1977a9c7744e60af0f7fd216
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV heuristic strongly indicate this PDF is malicious, likely a phishing or malware delivery vehicle. It contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are consistent with techniques used to distribute malware or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=can+cellulitis+kill+you
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/7gab29ql8udh11p7s9632e6bf5/18254921719.pdf
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/pumutepoxedunimebapuvunis.pdf
    • http://marinapogon.pl/upload/file/73846922229.pdf
    • http://avtokit116.ru/!upload/files/teverufekinisudubotik.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/9ce19a7a4ebae713894d98888677f09e/tuzokuzorapuzatajudoro.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c692f2be54b---xelukezovevawada.pdf
    • http://jrmhandling.nl/upload/file/gutorebojagopoxodopugiri.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf3d8019337---52262843742.pdf
    • http://apsencollege.org/test/fckeditor/file/togoxidaw.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/928ce9a68aa1dd7daacb2e62068bcfd5/77339984087.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/net926amvgfus71dsb1bmn9a6i/fuvetofeninikigasevopulis.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9028c61a8---78076617159.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/c75218259baafc049933060ca91ee8df/tevopuzizivasupem.pdf
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/94682066440.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/ef40e006a7dcf048918531e0a8791a99/27062279077.pdf
    • http://baigeleather.com/userfiles/file/vinifufigezi.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/4cd961f5ff07cd68b3392143dfa0d658/36791427327.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ecc0db6cff---josatorizo.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa49097ee28---5034010827.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608912c97820a---41800542380.pdf
    • http://solar-makernavi.com/ckfinder/userfiles/files/ketosinukotajel.pdf
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/j1jgnm1l2hqdu7ipclu2uvs1d4/68357351948.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/s25qh74b4a13q4pm5supqlssc1/75945746133.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd793a45845---90294188491.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_off0000f0d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D5 16792 bytes
font_01_sfnt_off000108e7.bin
6ca55db18ec3035582a48fb362fa56eb5e11fed26f11ef40a62a2caa4edf38ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108E7 16836 bytes
font_02_sfnt_off000134b7.bin
f339db747c0fd963cb33a34890e9cce25dd5d742348e10bd8df5d90d78ba926b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134B7 10460 bytes

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