Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fe72bb45f8620f7…

MALICIOUS

PDF

88.2 KB Created: 2021-08-18 09:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ace0544086eeeb7e181210147e682c8f SHA-1: b6191293642cf1313f2f3f09bd47e5014ea7aa52 SHA-256: 6fe72bb45f8620f7aaf2aab06cc4f8fd2fb03a3df3324cb7884e635eebe8f227
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to external sites, including those hosted on compromised CMS platforms, suggesting a phishing or redirection scheme. The file's structure and the presence of multiple links indicate an attempt to lure users to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chung-pei.com/userfiles/file/xufovotitujapunarotoxof.pdf In PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/0a34741aa97dfd276aba5d7335c4124c/guvutinat.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/20218171657318907.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160860d2118a7c---52914129157.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae866048d2d---18577292595.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/muzopewu.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/dalegemuxikexubidu.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/pafekexaroboperirekawaxi.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/52228542235.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/64529764969.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609b10e96f261---11769467223.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3b5c9a7fa---1156991660.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/04f654978def746512b3d1b496f57943/70685313209.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-08-10/images/files/wilis.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/77567785498.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a7334cdf07---56634256360.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/a818f9ceaac3ddc4a9a029b53e7d3698/jodororufiraviginuwes.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/gisez.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/peboxezabimaziba.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160963f5b27a2d---94687321137.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/dototapakajuk.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c6077cd21---wopaku.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d8234f7b6---gobelaji.pdfIn PDF document text
    • http://hopkinshigh1961.com/clients/878968/File/zusajojexaxojolel.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8021c3a277---90005529484.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/bevufovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+recover+from+a+groin+strain+quicklyPDF 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_off0000f34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34E 16620 bytes
SHA-256: 6fb45859f0db78a08479e97e3ec9e7c5bc97ef7257ea7fed48158dc8f1654627
font_01_sfnt_off00011e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5C 11276 bytes
SHA-256: d393167a6989792ea44c4b81ac706f12fac65bebc32deab2760c262f27136be2
font_02_sfnt_off00013896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13896 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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