Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c19a635b23b4d7…

MALICIOUS

PDF

188.0 KB Created: 2021-07-09 00:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 173730e3a3fbcb1a0a328299aacd38ca SHA-1: b9e64d5d98e1cff723c868212ca931a09e1485fe SHA-256: c4c19a635b23b4d748d37d736151423b642e47c4a8978f2e7224498176c85644
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a credential harvesting lure, specifically targeting MFA or one-time codes. The PDF contains numerous links to external sites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a phishing campaign. No scripts were extracted, but the PDF structure and heuristics indicate a malicious intent to deceive the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9148

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://pass-eco-energies.com/ckfinder/userfiles/files/36602604347.pdf
    • http://kokocurry.gm/userfiles/file/pagixetufovinalaf.pdf
    • http://griswoldremgmt.com/uploads/files/30979854152.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/7g3st2afpsbl03j5l5i19vv5n6/wamozu.pdf
    • https://dadrarad.ro/userfiles/file/kejere.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/86816447089.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/m90eeavdi51flrihum4kafoh04/bidaniketubonaranuwiladi.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/2323e338d6ebe78bf447672f8a2eda32/30871682600.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ee52f30ea---masakasonibemimeruka.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160725a119df13---79707313118.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/2cc0fdc28c5946fc5142d7ddc8d86fe4/jepowej.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/aaf46fd66adcf038a77210880ab02bdb/6830789437.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090020f79de2.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/zotoborofinavalijo.pdf
    • http://twfbs.com/ckfinder/userfiles/files/60018399586.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-6-19/20210619062311355129.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/10908ea14c6e0b78c44b895617caf41b/71412368900.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/b3b5519ba1d27f3761ea6f7faf944fdf/42015043449.pdf
    • http://automsystem.com/UploadFile/file/20210527212831779.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f08ee778ed---72890840157.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160acb3a9c46b4---dekibem.pdf
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/29870505921.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c3454134c---barobikabejegi.pdf
    • http://aaaexpressheating.com/userfiles/file/nukonuda.pdf
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/506865941.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941471392f0---musajenibekebibokak.pdf
    • https://stallion-international.com/userfiles/file/nanejawubodemosilivedo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=tp+link+router+manual+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00020669.bin
d5044898b9e63ca61deb37977a31acd080f56038dca57da5a03cca4b82170a07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20669 43132 bytes
font_01_sfnt_off00027751.bin
d6fe3c448a42b455ef82adb48bd769aa80a74a3ac753950fe15b9e451465045f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x27751 23536 bytes
font_02_sfnt_off0002b145.bin
5384c0ee71d6197a00307143b659715285b3b84554b8e10f437895820962e7cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2B145 10644 bytes
font_03_sfnt_off0002c99a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2C99A 16792 bytes

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