Malicious PDF — malware analysis report

Static analysis result for SHA-256 35ddb9497dca94b4…

MALICIOUS

PDF

113.8 KB Created: 2021-06-25 20:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ed44335ad6db496372761fab624cb6b5 SHA-1: a7d7d3687fbc3bd483152bd82a514c36d6f5b6b9 SHA-256: 35ddb9497dca94b40ad20de588e09f4cd534a6c7a304cafbf42409d87de810c8
164 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the link farm structure suggests the PDF's primary purpose is to redirect users to malicious content hosted on external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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
  • 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://queure.ru/uplcv?utm_term=friday+night+dinner+quotes+jim PDF link annotation
    • http://agcslohian.com/userfiles/file/rirepudiwovobeli.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/21268940785.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/1p84b4s1j6shgdrmsntuo9ssje/kaboxetabupujeb.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d945d4535e---zitububotubijemizufago.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e81fef01f---tenijedezuvume.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/fefulumivoxelunefisi.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16096511f9f64b---rinelifa.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad454c60e4a---59750149820.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4924e35be---joxugerizuvogisimimal.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/escjakmqnt4t4j2vulgg58f1aa/41005319490.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/bikumijosovo.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb00d82e10d---zuzaruvo.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/e3c2b348595014bbfa90e6d6f78581f4/49136846896.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607087c6398c8---zaxuf.pdfIn PDF document text
    • https://mclarenquartz.in/ci/userfiles/files/75200786107.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/mazuxivefemotesijawazux.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/2a3d6704f6962b3269718faa25b316db/fofaguwirulemepowi.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/81213ae36314408f7be52173f8c1f9b4/nexubefavovubozipoke.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20216241755195974.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/d3b7e275a7e556b5165dcba514768753/gonefevavegok.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b64ae9f3d07---25927689144.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/b036a51263b3283595e0373a96b1abec/bimutebexuvapopid.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160d391b9b7b3b---95170174831.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_off000154ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154EA 11116 bytes
SHA-256: fd0c735dc62d5c012d21330c24f9eb8001c8a06d3313488e22a542b8d907dedb
font_01_sfnt_off00016e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E17 20828 bytes
SHA-256: 743c71cdd554223075b7f1726421e9e2d6e9f6561dbb0d85f1a1f28bc1783a23
font_02_sfnt_off0001a1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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