Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d2376a8e153d235…

MALICIOUS

PDF

68.2 KB Created: 2021-09-28 21:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ca756f24707ddf59d7c05d2c9b967e91 SHA-1: b3cbdd2cbf7588ab0d623df00162dd12872e518c SHA-256: 8d2376a8e153d2353b27392cf15f3ba8460f8574dfb525026882d03a144ce2ee
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF is identified as a malicious lure, likely for phishing, due to its structure resembling an image-only document with a clickable action. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS uploads, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/g70ircd3bjv36093rcqduqv8uc/vutuzapezej.pdf In PDF document text
    • http://klsele.com/userfiles/file/1632203978.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/68172339246.pdfIn PDF document text
    • http://julianina.dk/upload/file/41585471199.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/wenirukib.pdfIn PDF document text
    • https://swiz.eu/files/editor/mumerutikol.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/32540385406.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/befelepafogoxifupuwuvawe.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/derusinemisugubow.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/69252403939.pdfIn PDF document text
    • http://ombs.ru/uploads/files/patosevofafenodifuja.pdfIn PDF document text
    • http://zerosquareonline.com/file/pakerubugivovebop.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/fumaxujesonaw.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1613b35406ad55---83197337354.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/48805225851.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/77047463798.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/58159036282.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/kufutafejolokopake.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae932979d3---wuzezokobodelelipo.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/nijikutigodevexodusina.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/22703210190.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/43cb6b7f83069ecc82fafb60f9fe6c7f/47155256282.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/xezokalufenudivodas.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/xulinopidasunefog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=halloweentown+high+full+movie+online+freePDF 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_off0000aef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF5 10736 bytes
SHA-256: e3b260101badd6d784380b2ec871a7ea8b8243f87804883b7e8b691be19f35f2
font_01_sfnt_off0000c76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76B 14392 bytes
SHA-256: 749054d0c55932e58627e31395ea6e4a3a1a1647db9ea4c1a71949d3bb68bf88
font_02_sfnt_off0000eb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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