Malicious PDF — malware analysis report

Static analysis result for SHA-256 5941844a1beab012…

MALICIOUS

PDF

74.5 KB Created: 2021-09-08 08:31:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 37a1d0ca7b52cea362d4a4e28b7eefc3 SHA-1: 5cfcd8a5c6145a055f89040571ce84adf7f7e57e SHA-256: 5941844a1beab01229e2ce3f69d626b9fe909a71f2255e523c25e65bbf951efc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple unknown URLs indicates a distribution network for potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2f2d1bc19---kozujikagage.pdf In PDF document text
    • https://letstravelforacause.com/miet/assets/files/jijovubatu.pdfIn PDF document text
    • https://csn-alliance.com/data/files/24542365326.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd2555423c---pabanexaxarazuxemoj.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/boboxusumesezoxonozese.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/96133108722.pdfIn PDF document text
    • http://keacg.com/upload/files/xafogaloxenirosej.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/1b140d252b7c2079cd643997c8ccf846/38420788704.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084dd4424074---puremuxo.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/50857244289.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/e91f7c091cdb01a41bdd9af0f4a35c2e/nisivolidudoninuvajegaba.pdfIn PDF document text
    • http://hphs1958reunion.com/clients/47465/File/26751354047.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d29f13aaa5---54123478626.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/37446577851.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-8-29/20210829232147763964.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/lemisorozukudiposazin.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1608303b0f1630---28710137419.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/xixomekewolaborevalab.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/c2ce8b4591d64902cd22b22f23a38519/miviro.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb5c0b72cf---lamixajirobaxupixiperav.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/doxizemagukekosebika.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/bodarixuresaviliwa.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/192530215.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/39460806065.pdfIn PDF document text
    • http://dadesigning.com/daduserfiles/files/sexenonan.pdfIn PDF document text
    • https://ebooksweb.net/files/file/92511639127.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=killer+queen+piano+pdf+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_off0000bd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD60 18068 bytes
SHA-256: c0907e9a0f3d9f4fc5a7819c82355f2199d99b6d4a368e78b7f95b04e7c038b4
font_01_sfnt_off0000eca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA6 10460 bytes
SHA-256: 288f4098008e8c4cb16c0769c38d417a28ed00e11926bf64b8de84ff1d289077
font_02_sfnt_off0001042d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1