Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb03b6f6fd2312c…

MALICIOUS

PDF

85.8 KB Created: 2021-08-21 01:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: cadc6ec37f26a3a69fd22f30fe796ad7 SHA-1: 00d9eea578dc5bc46dc87de4b880b35fc3a4340a SHA-256: 7cb03b6f6fd2312c26e2e33b4a7901f7df83d626554b65f9067f7baf00b632d1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to potentially compromised or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous external links and the PDF structure itself are indicative of an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 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.
  • 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://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/vunuluk910a63qp6rav2rvsevs/48054090468.pdf In PDF document text
    • http://jiuxingchaoshi.com/uploads/file/26162612876.pdfIn PDF document text
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/pedipu.pdfIn PDF document text
    • http://orderkai.com/uploads/files/zazutoxasipitufomakimano.pdfIn PDF document text
    • http://hhtaitung.com/CKEdit/upload/files/47856657443.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1ca245372b51673ac133a8bb2d179f66/lugapuxidilok.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210719_145021.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/tikalumabomivirub.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/vejiboturusorajinoxipun.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071275a0c97e---rugowojelobinaza.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f42409f44d---51604597755.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16076ed21ddf59---nifusek.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/nolomirarerexoti.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/fddcc026ac7308fd5798e7cf65c330d8/basitivetuwenuba.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611cce9430c49---32797574315.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/kilojupopizavij.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/sekizifogajibasuloxatid.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/22264421357.pdfIn PDF document text
    • http://heureka-cz.eu/files/nuxeg.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/fowero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=analisis+del+cuento+emma+zunz+de+jorge+luis+borgesPDF 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_off0000e85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001006e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006E 17560 bytes
SHA-256: f87d9d9c1496043b347e438983ee92a931837ed36ae3def5e53d1890a132d490
font_02_sfnt_off00012ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE8 11124 bytes
SHA-256: 7c8d405d8bd21a59279c07a3c05fb5d8b568147d361a3df91b21c3b2e755b804

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