Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8445b1e2814e67…

MALICIOUS

PDF

92.1 KB Created: 2021-09-16 03:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d074ef9a5ececb61332c3dd740edd5db SHA-1: 42eab99c2af60579e3531240870af9d9b34538b6 SHA-256: fd8445b1e2814e6725e6eb922857f070acb33e7feb4fa6e23f58609bada468df
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://castrolmintabolt.hu/images/upload/file/68789329206.pdf In PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/77239941763.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/fobezokedobo.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/31662181633.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/ha0huadu38b0hs83rj3mivimje/57933759241.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a0c2baabf---redut.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9df1b6a05---noxuzivexoz.pdfIn PDF document text
    • http://fuli-capital.com/userfiles/file/dizomapowodedimusibaje.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/gatikedudixawixu.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/50552526069.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/464cc13729f6de480a8361667a3bcea0/41915317572.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/i73782lq3lt39niqohivtkt0gr/xareradelobupowo.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/tiwujenafim.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/kidofovetagupij.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/69968042261.pdfIn PDF document text
    • http://rinsacars.com/files/others/rekatepuxerexeb.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/nogupamidok.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/52325176448.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/660213266.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/76110308310.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/zidado.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/nitorujo.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/dutipekimexoxulobawuni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=hack+beach+buggyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF17 24508 bytes
SHA-256: ad093f0576fb52eb954243f1538f1fb4fde955206f5d36e8848b9ecfc4983ab6
font_01_sfnt_off00011d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2E 16380 bytes
SHA-256: 87949d08ef357b4c89d75ca96f34cf5ff7da137f183edcc14b363087a11c323e
font_02_sfnt_off000133c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BDE 10220 bytes
SHA-256: 15d235066b640f979154532ae3087033d2b80f25122a0c4c478913f74356c65a

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