Malicious PDF — malware analysis report

Static analysis result for SHA-256 7340f5a1fc10064a…

MALICIOUS

PDF

90.3 KB Created: 2021-07-23 01:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7aa66d95f4b3d29d622e3c46fa4d1d8c SHA-1: 7fd16c27c8c14399574f3597f38e4ea5db7f2a97 SHA-256: 7340f5a1fc10064a89e1e909108a454b75c04bb382afaf8c80311b64e737367b
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many hosted on compromised WordPress installations, indicating a link farm designed to redirect users. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecdecb5b807---28688768210.pdf In PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/7765818c3dbb488ad3ca79c208044d50/kofegonilekera.pdfIn PDF document text
    • http://hkacca.com/userfiles/71615301877.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/17616153007.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5702537927---wefejuxire.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce195148682---54924316327.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/9208542e5ea74c645ebb6e239e33160c/58414244806.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/660c6407b29d861c13f4bd73df087dba/25944468688.pdfIn PDF document text
    • http://riverbendhay.com/clients/4/4e/4e1cbd84181290ddb66fb035c9950ff6/File/vafodite.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/71717078346.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/96956419367.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/c68307064bacf894ded9d792b953373f/47873176361.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/vakovulesisirunabodaw.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/59982762194.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be08e999ad2---2531723005.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/dopenavixefap.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/19845729995.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160958b76c81b4---duvoxoratalazedibesex.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077d68c87169---sibopigol.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/41717525486.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/71212380202.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaa309a181---79422047119.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/sawerek.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/2871b967c747032c147743956028ce5a/47812031017.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=2nd+c+section+incisionPDF 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_off000101ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AC 16776 bytes
SHA-256: ec6cb4b15f1aab28bed66897086bc452409494c6075a12a66c9e78ee524e8ea2
font_01_sfnt_off00012cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDB 10076 bytes
SHA-256: 7e24450fa9ff35375c39b7d5227b2f3f5590c59003349cb6000ff5a04eaf4d89
font_02_sfnt_off0001437d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1437D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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