Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa5f6f35d8556ab4…

MALICIOUS

PDF

74.3 KB Created: 2021-09-19 18:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ce033da9a3aedb0b05a1aa4a5706ca00 SHA-1: c52da47c121eec381ba595026e84a6875cf6f1b5 SHA-256: fa5f6f35d8556ab4d72c19a41f166eb5a76a77ab3fbdfb6169451ab86a1fd9e0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Heuristics identified multiple links pointing to external PDFs hosted on compromised CMS upload directories and disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://agrocare.ro/ckfinder/userfiles/files/daduxenijageromivebele.pdf In PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/kozagixaretolotosaso.pdfIn PDF document text
    • http://accutindustry.com/Upload/files/20210918204952.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///70354719290.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/patikiwetudajasemewetufib.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/fisakok.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/33466122218.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141a088aa767---19998617286.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319f1cdbca2---40277012134.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/rorelavanuzovonaxu.pdfIn PDF document text
    • http://unibox.lv/files/text/42133513818.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/sonuzanonekarase.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/kokanetulunuwebimajoguto.pdfIn PDF document text
    • https://wineart.online/userfiles/file/21986058755.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420020711da---58257045871.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/lilagujalefog.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210902022639_263444022.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc08caa4a0---lugepozubasodokawa.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/15106466995.pdfIn PDF document text
    • http://secretinvitation.net/images/files/bevesujevenagugodobotivi.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16138dc1c9350e---lipozilumenifog.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eff253094f---76028254865.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=connect+note+9+to+pcPDF 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_off0000bf03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF03 10000 bytes
SHA-256: 45b9a5bd2ccbddf8e844827b3c839450ac85db71cdd827ee0004efd43fc65817
font_01_sfnt_off0000d559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD559 17868 bytes
SHA-256: 70e3bb3440946756711e10014bc3d42733ed2a818d7ddf1330137fb22ffe9eed
font_02_sfnt_off00010420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10420 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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