Malicious PDF — malware analysis report

Static analysis result for SHA-256 20cd5c7b281c5a85…

MALICIOUS

PDF

138.2 KB Created: 2021-06-28 13:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ceddbc00f8dffa5bebea8d39636f1937 SHA-1: fc33686a4f8a81b1f7814b2da67372cfdcc8e971 SHA-256: 20cd5c7b281c5a85194dce19b1a3022295be7fa1879e4ae564539c946e8a5239
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm pointing to compromised WordPress upload storage, suggesting it's used to distribute further malicious content or phish users. The presence of multiple URLs hosted on potentially compromised or disposable domains reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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
  • 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 http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6eff03020c---vofupunufesatuwolisu.pdf In PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/d856449f6f385d66a9b04d3b5c281668/99192001979.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02a48c056a---popazu.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5397e395d9---46830409757.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/jefevujanivusupo.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1056ea918---funadarirowe.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/8pbithfjpincol7pq1bhv4j4tf/47177206417.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/086dd3ec7bfcf9e288662db8e6430813/15400217719.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/aec2c16ac12ed21b318ff49e2ea1e596/lifakomagupulu.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/e6a7f1cee09aad050392957c2501f2a8/27506860500.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768bf6d3770---rerasofozalovo.pdfIn PDF document text
    • https://scheidungsrecht-best.de/userfiles/file/38746454124.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/gifemipab.pdfIn PDF document text
    • https://kermanrooz.com/img/files/96975858796.pdfIn PDF document text
    • http://smartarts.bg/userfiles/file/tawatuj.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/21502451607.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/712ec526d5c4a9be9ad34e9d32f69b1e/49862689474.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/76374013266.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/sapefenawat.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/kiteratoragebe.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/0072ee576a0337eb5e3dfe94139398f5/rimuwaxotixun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=gold+experience+2nd+edition+answersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B1A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001c9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C9BC 10856 bytes
SHA-256: 97f94316060a9e20c9077feb058f186a422c33840407ca162e8f8b799e044b15
font_02_sfnt_off0001e30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E30E 23700 bytes
SHA-256: fa509c5183aff8675045c134a87ce6e19520c408aeaa8d00524098318757f8c9

Open this report in the interactive analyzer, or submit your own file for analysis.