Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f5d5b270fc8aff…

MALICIOUS

PDF

87.0 KB Created: 2021-07-20 10:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4cb08d1fde41cb4a0268d10dff39f824 SHA-1: a314b3a55d049d966d93544d0bcc67123f86565d SHA-256: 03f5d5b270fc8affb5668971bb089f2c5d2c05ab295f6c72f5ea0cca6471ea26
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, and it contains multiple heuristics indicating it's a link farm pointing to compromised WordPress sites. The sample impersonates a cloud document lure, suggesting a phishing attempt to trick users into downloading a payload. The embedded URLs are likely used to host or redirect to the malicious second-stage content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a52fd55a93f---gazunebipadigesujidadajim.pdf In PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/21987865274.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25f3e01897---binonejelukoxopula.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//vuxejisigozinefa.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/fevidawapuwojafegegemu.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/83400133720.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa479092ea---34694583297.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc9613e639---76189383822.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdde8dec2a7---xevifaforevumijurumaf.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/vusuzofonozewire.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be46bf3d9b8---9264185947.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/osvlnhgd5dslflsohvuf2dsjl1/raxazazibole.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608941a32f93f---68433679122.pdfIn PDF document text
    • http://richwoods1969.com/clients/861079/File/jinomolipirul.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/31886519650.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d8f346c37---51477924913.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/lukamisaxipupoz.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/5a4da6f6e4dc52143d392f8abc0252b2/95732068508.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/p1bfkjr6qs4143l7rv0lsma965/nibeluxevofurorazukobokok.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/mqala2v3060a7n42hqj8b7sc05/zesulup.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/34070703391.pdfIn PDF document text
    • http://avonsteel.com/UserFiles/file/45348783257.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/gegubuwi.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/23686896924.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=received+by+meaningPDF 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_off0000f009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF009 17456 bytes
SHA-256: 41947e48ff18b0d3aa337037a32457f9de315ad0238a2f8e0c371c8f242f94a4
font_01_sfnt_off00011da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C0 10548 bytes
SHA-256: c82b7845a1971e27b35d29befb9b5bd291d3b9d6ea80f63ddb065a507e1751a7

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