Malicious PDF — malware analysis report

Static analysis result for SHA-256 21eba794ef39a935…

MALICIOUS

PDF

70.5 KB Created: 2021-09-02 05:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 88123ed0915429d3382977f67e87b6bf SHA-1: bd18dcc577dd3e0b338f9b0dffff779058fd191e SHA-256: 21eba794ef39a935e8647f792632d95b537018ea888259f467241f92c9f0f6c8
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/74d9e3d8081e80b7f8ee1848567b9226/gapekulamuxiluxav.pdf
    • http://nbkhjc.com/uploads/202108/file/210829225825046063gfl06ptkjl8h.pdf
    • http://www.aqsclimited.com/EditorImages/file/91122713688.pdf
    • http://paoladebenedetti.eu/userfiles/files/82602967253.pdf
    • http://marketypik.pl/zdjecia/fck/file/79906867537.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16083b87f4bfed---jisalolazewazinurabuvenen.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610dbcf09e482---72977166116.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/3b094311729f74f10329580d412685c4/wijoxe.pdf
    • https://debcopharma.com/userfiles/file/79657041766.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a57b9ef1e2---mepujadusobu.pdf
    • http://spc1991.com/ckfinder/userfiles/files/wexavirete.pdf
    • https://topupdana.com/contents//files/tubuze.pdf
    • https://walkandsmile.com/userfiles/file/56614067212.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070927c78710---bizemuzigimikifumugubuxew.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/nasimuxulepupovo.pdf
    • http://regimhotelierbucuresti.com/images/userfiles/dewanu.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2fecbe8e7c---98935509807.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=difference+between+inductive+and+deductive+reasoning+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_off0000b380.bin
8b62131eb21eb47d9e2315ccaa6687d4e271dcce3a5eac37d1b260bf3b99ca14		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB380 15380 bytes
font_01_sfnt_off0000da87.bin
e67e3f19481d1cb6dd3bd4cebc78a8267ac40dbb021a5dc4f83e8e47f77e4391		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA87 11144 bytes
font_02_sfnt_off0000f465.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF465 16792 bytes

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