Malicious PDF — malware analysis report

Static analysis result for SHA-256 142c41a221da22b0…

MALICIOUS

PDF

73.0 KB Created: 2021-09-11 10:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fef5cd841540180c4f1a99fa369493cf SHA-1: ff79f2e4d38e1daba5f525192ed698daed859857 SHA-256: 142c41a221da22b04e7640eff8bdfd9493daf20c70119204d7ce1d535620c606
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains heuristics indicating it is a lure for browser extension or update installation, a common social-engineering tactic. It also contains numerous links to external URLs, some hosted on compromised CMS platforms, suggesting a distribution mechanism for further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the observed attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://mvdeastudio.it/userfiles/files/papive.pdf In PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/gg2k4r5uadtdf8og1va190vgtm/85382201494.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/nodupaxomukixajawobu.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/q98te2k2bse7hqfeaqc1n1v1c4/88524370204.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/55991823872.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/fojazeginadabekawovimutiv.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/sezugex.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/11520585002.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c06cd62a3a---viduzobaxakalezodoba.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/3803620944.pdfIn PDF document text
    • http://atamergranit.com/userfiles/file/65570589205.pdfIn PDF document text
    • http://fxmeat.com/upload/file/e7d22a07217ee781d61be5adf039d06a.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/41018146744.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613420a7b78fb---45972221839.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/sevavopexobafe.pdfIn PDF document text
    • http://fruitsad.pl/images/file/7818490384.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613283cc97b16---tisebosaridup.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/73020965205.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/jevol.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136488a75c84---zidubemovorutoxobe.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/44896240072.pdfIn PDF document text
    • http://hjhchem.com/upload/files/99070116360.pdfIn PDF document text
    • http://starma.pl/files/file/midojiletugutuxakerali.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161386f63cc998---nuxonuwazazimafugemobiv.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/93873768217.pdfIn PDF document text
    • http://bibikid.ru/upload/16687729234.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nowepadimusoxujifabe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=cast+to+smart+tv+without+chromecastPDF 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_off0000bb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1F 16544 bytes
SHA-256: f550ee7514abe06ff27662beea264b1fc181be3455356957c8ab3d5d6c1a2aff
font_01_sfnt_off0000e5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDF 10628 bytes
SHA-256: 0f120632c1435727e7ff1fdaa019eb979972ed6b993b1a2b3f311befd24bacd6

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