Malicious PDF — malware analysis report

Static analysis result for SHA-256 819071edaa805200…

MALICIOUS

PDF

76.2 KB Created: 2021-08-31 20:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13ad99b973efa3190f91ff2201abc285 SHA-1: 14dd7094544ec1332397ba5a40fc09e6247b51d0 SHA-256: 819071edaa805200de63751fdcab9094f054bc9943c029b3a780603f5ff2565e
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable domains, indicating a link farm designed to redirect users to malicious sites. ClamAV detection as Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 and ML classification further support its malicious nature. The primary goal appears to be user redirection for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6242

Heuristics 5

  • 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
  • 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://synerhu.ru/uplcv?utm_term=golf+solitaire+rules
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/ab70d048e9557a98d1ebf51e4cce9e95/rivonejadegip.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa1550cf96---69526971382.pdf
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/19009700458.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a729dd2657a---nidawu.pdf
    • http://remaining-mc.de/userfiles/file/fojodirawilivexogaro.pdf
    • http://usaoxin.com/userfiles/2021-5/file/nipunuvebax.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160831d0595ea4---98569098103.pdf
    • https://alyansdugunsalonu.com/userfiles/files/75139325800.pdf
    • https://pima-alarms.rs/slicice/file/29956764949.pdf
    • http://autavrabek.cz/obrazky/file/84513174738.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/j71eoaekir6eou2j66878c949f/98721205600.pdf
    • http://work4shop.cz/userfiles/file/xabugovekawuvoge.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16094c3758936e---66579904062.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088ec8d05e31---xuxezaraxokawudimevijo.pdf
    • http://anhbanglaw.com/userfiles/file/71910928841.pdf
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97876276617.pdf
    • https://mimpishio2.net/contents//files/24249728145.pdf
    • https://toananhmedical.com/uploads/files/pureganika.pdf
    • http://centrlita.ru/archive/image/file/zetuliv.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcfb495c96a---xerik.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160826fcf7ff00---52469917333.pdf
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/papupiwutupuvarojove.pdf
    • 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_off0000e571.bin
469ba34c4e30051f535d111c670d8ff0206192e24aa132018aa0731686c85a13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE571 10240 bytes
font_01_sfnt_off0000fca3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA3 16792 bytes

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