Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c8c718454ae758…

MALICIOUS

PDF

86.7 KB Created: 2021-08-01 18:42:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f2208eb0947a9c0038ad4b5812c5ac5b SHA-1: a103a9e089f290103ac14b1e69cc17f305a162e7 SHA-256: 16c8c718454ae758452be34c2269774533bdeadafe1eca2982662a2aac7bc6c3
172 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. It functions as a link farm, embedding numerous URLs that point to compromised CMS uploads and disposable hosting domains. The presence of 'utm_term' parameters suggests an attempt to track user clicks, likely leading to phishing or malware delivery. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://crewmak.ru/uplcv?utm_term=flipkart+quiz+answers+today+guess+what+sports+special PDF link annotation
    • http://qtjdb.com/UploadFile/2021/05/24/file/20210524_160610_185.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c29c2a4be---85150122413.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16089ad3368cf5---gifot.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/45845991160fd3a65164cb.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents//files/numosi.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/dofefunepogexonalu.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/zitogazidekidimu.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160bf42187f49f---fagixawiz.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/vixajulurup.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/damozelobagow.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/fab3620a8f61dd9f6c9072c56357cd32/sonigobixirul.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/2812064671.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/boretuxali.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5932746b8---zabopep.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/webamuvafevulaxuvujowiw.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/vonik.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/bexiwebusevusenuzozigega.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/miberomipap.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/fumozimutapixurad.pdfIn PDF document text
    • http://wernitznigg.at/files/35833594617.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021071475720_813562917.pdfIn PDF document text
    • https://ka-base.no/images_content/file/mudezekawuvitowuziden.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f24d70d3f---xexuguxaxekex.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001030f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030F 17728 bytes
SHA-256: 908a6f1ba9403181d8d1d8c075e7a04a38f4fdcaafa4eb95d47dbb486cc05d5b
font_02_sfnt_off000131cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CC 11368 bytes
SHA-256: 71629687836f9d8140feacb7823c3decd6eb82f6513c554835e8d72f8bc8a28e

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