Malicious PDF — malware analysis report

Static analysis result for SHA-256 22a2f90baf5957bd…

MALICIOUS

PDF

84.1 KB Created: 2021-08-19 05:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e03551a8c16da3b961fc2607f0a08f7a SHA-1: ab87cb525a55990a62a996083be067617d6212bd SHA-256: 22a2f90baf5957bd6f62cf2a8d3777ade9254a363ab978d461ea477099f6d6df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It functions as a link farm, presenting numerous URLs, many of which point to compromised WordPress sites or disposable hosting. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of external links suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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 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 https://deitratech.com/userfiles/file/jupox.pdf In PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd64ca0f136---11237788709.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab514efc50---timuximekirajolo.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b834465c033---noxujawufuxuta.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/hgp40k6he2kivphrlqlo5n3mre/7956010638.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/zigadivilog.pdfIn PDF document text
    • http://unionzglobal.com/ckupload/files/9381090614.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/fawilaval.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/7ef745816d446c5d88bea35ba647bfcd/lopobopibajakuju.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/lotosovonaxesevuxif.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/70018395384.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/to552kbnkuqtc78igmerqrbhi7/80326935005.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c14b91d37---lusowigasuka.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/turenatipiduf.pdfIn PDF document text
    • http://weingut-suppan.at/files/26540722516.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/9ff289c9e9dd631cda0c3ef455877943/5782493885.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/38553074732.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/39815708451.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/05drva01gqohovar1ad51iu6h2/velosipodebi.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d234265aa19---vepexofitisa.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/mcl2f887aoijmkjemoir5fvk55/rusixixogafajak.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/watatetitarafup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=burger+king+coupons+canada+december+2020PDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/zexovubejakilugerax.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_off0000df56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF56 11340 bytes
SHA-256: de4b27833b1bb1d3c4e7b4b4f878800e115051c528672d89a6c93f35d7361de2
font_01_sfnt_off0000f99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99A 17964 bytes
SHA-256: 29a2410d06a86ddefa27ab580af48a0a954e01c7a711de80bf9caea899022d37
font_02_sfnt_off000128ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1