Malicious PDF — malware analysis report

Static analysis result for SHA-256 6483ae8f716c4adc…

MALICIOUS

PDF

80.1 KB Created: 2021-09-03 21:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d84af000eb27b1d90fcbc6ec34b98aa1 SHA-1: 300678de28553d1b44fa7fda83ef6eb8f34daa65 SHA-256: 6483ae8f716c4adc78b0aed0899f3d87184e690470290dfc73a84438f1be274d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=ajcc+cancer+staging+manual+8th+edition+prostate+cancer PDF link annotation
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a044c083e8b---pemomobunevasomibukofogi.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zexukagax.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/28164309369.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/29888887358.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/1531307947.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/zefiw.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eb98906d9e8ae60c3480a204d3975cc6/bopujasosexirata.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a979884117c---zopovabuleromimunum.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/walonolinesetimeme.pdfIn PDF document text
    • http://fishingas.com/userfiles/file/tefabirututajogubejasa.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/87844175145.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/42754365295.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/ffe7a0ebad964c8aeea3f9b4f23ba350/lefavofuzed.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/fffd9mt4nf8nnej76nh433p42q/nojuliluxusatoma.pdfIn PDF document text
    • http://bbgannualseminar.com/clients/6/60/607ac775fa755cf068047886b2bbe24d/File/54193026566.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16093fa7196071---zifif.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c14b99509ad---mutiroxuriwikurovoduzuja.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb6f1235b1---49519245750.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/f10476f3cb77b677e2785b027654e16b/fowagodopujodebuduwo.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/wizagelowazenuredebujo.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/winizumifalawujuwofijene.pdfIn PDF document text
    • http://jaika.in/images/documents/files/26159044685.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/82728246583.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C0 11380 bytes
SHA-256: 885256a22b50e8dedbad0249e28f69f8aeee25833d9b979aaf0b9229400bfae7
font_02_sfnt_off00010436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10436 17860 bytes
SHA-256: 35fe584ccb30ebd712f1bffdf64143f130c9bb280bcc5dfa3b60ed760ac6a1df

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