Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3cfd79b632fa588…

MALICIOUS

PDF

77.6 KB Created: 2021-08-13 12:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9aa4ee3818408c1a9ef299202b1e3bf3 SHA-1: 251fce5c82de83c1f6cb9da9b928068da402b8d2 SHA-256: c3cfd79b632fa5889f1ce96a380ed01d9f2e4c2899e31445e00bd0da43b4d14d
174 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8287

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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
  • 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 http://stigstudiotecnico.it/userfiles/files/vafefo.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fd7a48118---jakamotugatulupipadediwo.pdf
    • http://kssi.ir/public/userfiles/file/61460010596.pdf
    • http://local-minicab.com/survey/userfiles/files/litogonifevise.pdf
    • https://pgp-puh.hr/fck_media/file/41370489077.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91d395918---4998845027.pdf
    • http://gift-founder.com/archive/upload/files/vomiwetuvumexaxofagitu.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/4f91fe87c451a17044b231040b19f025/80156944190.pdf
    • http://52.74.160.208/ckfinder/userfiles/files/7188170606.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d1dc72bdf---43333598333.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/2a5783e5c8acc1d5f49a671aabd09089/nanurofuxufusoxez.pdf
    • https://mgrenginiai.lt/ckfinder/userfiles/files/bataxije.pdf
    • http://cephedanismani.com/images/pages/file/ribizisinekake.pdf
    • http://megalaserasia.com/upload///punanusuwukigelebi.pdf
    • http://alanurturizm.com/rsm/files/85119610271.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/afbc1c168c71e84ab70ddb1b3a56d33a/goxanerupejuleromese.pdf
    • http://hrudolf.com/userfiles/dajabo.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/33f0a15d405601a8ff6b4ef3c058b072/dulezawalikameku.pdf
    • http://bukharageorgia.com/sites/default/files/file/resinixadok.pdf
    • http://thanhlapcongtykiengiang.com/upload/ck/files/vifazijabaf.pdf
    • https://makanbanyak.net/contents//files/83444571413.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8da5f10acf---repigodowejisa.pdf
    • http://nicolalazzarotto.com/userfiles/files/potalagibegokopi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+do+you+get+unlimited+coins+and+keys+on+subway+surfers
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CD 16792 bytes
font_01_sfnt_off000111df.bin
36353c1bffa4205c9fbc4f8b09396ce40395ed21576ade520592475a7f881215		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111DF 17056 bytes

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