Malicious PDF — malware analysis report

Static analysis result for SHA-256 e53a9af5e6bc231b…

MALICIOUS

PDF

86.8 KB Created: 2021-07-05 04:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: dc011701ae323ee4789d81c818d1b4cf SHA-1: d99174aff8e96143ae4d5c681822a874eda1ee38 SHA-256: e53a9af5e6bc231b0a82b460b7fa23f7f149672acce128f9949edbdc03cc6ff2
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites, likely to distribute further malware or phishing content. The embedded URLs and the nature of the link farm suggest an attempt to disguise malicious downloads as legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://sieuthibds.net/images/files/norazupaniwapov.pdf In PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/0hoimes2s89piql6pa6dhkumne/52284362066.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/f6ad09bad3725c0e4872d1ec924c5111/4389257638.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9511992e4d---247779857.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/e2280538767c7f26edfcbac8c94c92b5/mapiwapafirupe.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2d6a5fcf0---masekixadavisexajoba.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210621072615523.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/3b6bf4cb3dbcf607f364695fbbef698c/bapotosukuvufupeni.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aebf42648fe---wirivoziluv.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/tuvapovirupivazagar.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df05cb35fd5---rujoxawe.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/nofabefaxunitusez.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/gobowelimogebawiramides.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/60148818630.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/73465680298.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076839dee870---devaguliwesudamijabi.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/6v7blkli6kgcrp6bmodhcod4bt/9377724141.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/tatugenibubivemu.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/rijerame.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/cae764e8669b6ef3ca533c2c708ae5bc/336832606.pdfIn PDF document text
    • https://12waktu.com/contents//files/92053908777.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/54ktnf2dc4a64gfece1gv8g94b/veragaxumapamak.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles//files/taxob.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/db5p4oi8cgr69tuhq8cimfet63/37371285998.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609875329552f---puwafamitusupar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=pokemon+all+games+download+for+gbaPDF 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_off0000ec20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC20 10824 bytes
SHA-256: 8be9a4ab1b9bf11a1a0ef920d48ba74f896b9fada3dbc5080006e19c73de7cc6
font_01_sfnt_off000104f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F4 17932 bytes
SHA-256: b263ca245f2d8541ca125b6797081d195df0439d342cf62f34ed262c167de936
font_02_sfnt_off00013435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13435 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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