Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a89d1f5bd70f13…

MALICIOUS

PDF

83.8 KB Created: 2021-07-08 06:41:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b98a9e2599729590e5412470a0c8a1c0 SHA-1: 1389f410b3dec4a8bb54a14d564b1735397455b1 SHA-256: f9a89d1f5bd70f13599717a3a0a95e0bf2674e4bb0d73ffdd25c4e803654261b
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains. These links likely serve as lures for phishing attacks or to distribute further malware. No scripts were extracted, but the PDF structure and URL patterns strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3632

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://laborke.ru/uplcv?utm_term=a+sow%27s+ear PDF link annotation
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/160770a145f132---24881378170.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20216251927167561.pdfIn PDF document text
    • http://matthewsmillsreunion.com/clients/c/c7/c7863f7b93cb17915b2a89d887155530/File/sinob.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/o76752r9n7g9dtmm53umt06b67/runizamuporufewegegupipe.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086dd18f0d79---zofutolitemifi.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/6fb96d9aa17353fd17ccecd3278c0c58/sipobinilu.pdfIn PDF document text
    • http://entiambalaj.com/upload/file/fiwajosu.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/giloxenunefobivirerexe.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/c6360f7cf969c5995c6d907c323f86d8/fafizitolotojufapupo.pdfIn PDF document text
    • http://amandamaitland.com/images/file/savalajedaxof.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/87654186193.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210630021318.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///42135630793.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/1udfdufh6lkn12qjg73jgbit75/20640977382.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/tuzunipijovibotim.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/26010305640.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/73be196d780681109928fcea5692b8f4/sukomotogowutifuwoku.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/32775743543.pdfIn PDF document text
    • https://yellowstonewildlife.com/36933247298.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160711f1e22e8d---54223107031.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/569be2f356f2780ff9bb5547d7db13e9/50950012597.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/2342047925.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/73272196235.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d3e779fc8---97535160471.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEE 9864 bytes
SHA-256: f5787c9fa9651df3b5d2fdec4e587901787a79e7a02a2375f4070e011898fa27