Malicious PDF — malware analysis report

Static analysis result for SHA-256 581f18ab3630a2e8…

MALICIOUS

PDF

75.6 KB Created: 2021-07-05 04:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5e4417327bce897bd46b801fabb73171 SHA-1: f6984cbf3eebbcf06b56bdd917061f83507a2658 SHA-256: 581f18ab3630a2e83704c04d5928e7e98d114674740b1c84036716b908a083a5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5478

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://krisoc.ru/uplcv?utm_term=in+the+mood+for+love+soundtrack PDF link annotation
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/afpbvgpp4sf4cq8k6qpp7nduau/tivadavisoxu.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3e8fc9440---74850285495.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/2f1051fdfa9763bded87dde0794a0cfb/76472321624.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/a6q2242biaudr10vudmrmrvtfh/39501236401.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/hjk636c48dkj8ar95suntogdm4/79963172571.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/62184021233.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/78431165111.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1b7a5e280---8995568184.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/fikasesur.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/2811f3f3174e5dc276079ea4e73bd7bd/96160962832.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c23514a71a2---1356946836.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df94f94a938---46391397402.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/eht1gctrmbugocod9t5tfdbhpo/93533772828.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/3979e3e65364b204741dca9fc7f476c2/lapofidurapedel.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/5ub5e7r5ml92c1vs88a50dot13/zadogaduxexubepojegas.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/ketajanuzilam.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/1f612c22e1f8b7513f3fca9dd82a79f9/gazikalusajonorisexudira.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/54939452757.pdfIn PDF document text
    • http://edgecs.net/documents/mukazigisaz.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/bamowef.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/zixabif.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/0bf1fef579244a245ab8ddc8a26252b0/77908905050.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/989migfhsc37s2tgf9kh4oegu0/74945424670.pdfIn PDF document text
    • http://meechoktoolmart.com/user_img/files/wisuvajawikikowuwogo.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_off0000fe40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE40 10856 bytes
SHA-256: f4df59d06de70cd72566f644eb4e85e9d62bdcb53f6f4eb87a90ec1cae8bd0ee
font_01_sfnt_off0001172f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1