Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b85adcf2fd805ed…

MALICIOUS

PDF

82.0 KB Created: 2021-09-14 03:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 006ac19c7a362e0c65d7297926cf1db1 SHA-1: 3b9fcf78f7ad5f7cb66c1625d16c92848400e18f SHA-256: 2b85adcf2fd805ed2e7c75d6e9b8333077ca31b8cd93321a113b6fea5ac4b5bd
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to other PDF files hosted on various domains, many of which are identified as compromised CMS uploads or disposable hosting. The ML classifier strongly indicates maliciousness, and the structure suggests a link farm designed to manipulate search engine results or distribute further payloads. No scripts were extracted, but the presence of embedded URLs and the link farm heuristic are strong indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://rosanaalvarracin.com/userfiles/file/90964106234.pdf In PDF document text
    • http://kahounova.cz/userfiles/file/32989889612.pdfIn PDF document text
    • http://hainfelderteich.at/745576903.pdfIn PDF document text
    • http://pedraferro.com/files/files/83464296745.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/kemin.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/50679539902.pdfIn PDF document text
    • http://safarang.com/basefile/files/rezatidavudi.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/36576352935.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/fofefeluzepunupedagigi.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/73981170190.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/wuwuvadulurumotumed.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/fibilubisemupoz.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/xatanar.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/78257828034.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcc916bc3f---22746028313.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/zesisimowuj.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/gafiluduxuwutola.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161352c9d8bdd0---falenibawifi.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/d2fc1983ab073bd54e14089a082c19ab/24943267326.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/74285057359.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/19103594578.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308ca5ac22c---latevuzalepunix.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/19832874226.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/66678669325.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=mirror+handphone+to+pcPDF link annotation
    • http://forum-auto.ru/data/files/69557366084.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_off0000dd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF533 10392 bytes
SHA-256: a588e3e958762933348d16e620029114b2fa78d372dcc3611818bc36f9357cde
font_02_sfnt_off00010c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9F 17968 bytes
SHA-256: 15185b3fbfc5cc027a43ac1416e2aef677e48dcc7ed7d3a802968dcec1c25962

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