Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b081d5fcf38e516…

MALICIOUS

PDF

72.3 KB Created: 2021-09-01 20:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 926fc4232ac28250ddc2bfe8211a7e4a SHA-1: 53d16ea71cd996a91438405c43a34b62ef8659ba SHA-256: 6b081d5fcf38e5166d847a317f734401ff810ebb8055f4c7e04d0260fec85928
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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://alfavs.eu/userfiles/file/jazazenosefanox.pdf In PDF document text
    • https://bselink.com/userfiles/file/73011809138.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/37807741252.pdfIn PDF document text
    • https://digireg.nz/upload/pexabab.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/pejivani.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/38774160698.pdfIn PDF document text
    • http://bvsaigonbinhduong.com/uploads/files/97819690369.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/newujune.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de17e82d06---13911397289.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/latefifebilesoden.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/wejifoxuruzigokedezu.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16083c54521f2c---99206613705.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a88136af9d9---94769832169.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/wojemax.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/7ba0552e4868165225a0106e64eabaf4/mufulujuruk.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160738ca3d8013---37214665656.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/rufekopirukapetetagu.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3ab14d5cd---delufe.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/85387279486.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3fb64f183---misuzatokutazexit.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d609ec499---xosukokanewipeko.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/3hoqttc6ggv4cro37e9fohifh3/nexuliva.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0fbe334a9---70604540381.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=naruto+the+movie+7+the+lost+towerPDF 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_off0000b508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB508 17456 bytes
SHA-256: 480b97cbe9b1b436a44486d997b895b0d1a538b636177b65cce29c4ed7eefbac
font_01_sfnt_off0000e154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE154 10548 bytes
SHA-256: 3c24ed5d7515f5f07c356718a3b950578903e8551edf67439701f6da7e9d88db
font_02_sfnt_off0000f988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF988 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1