Malicious PDF — malware analysis report

Static analysis result for SHA-256 1407d007fc455cef…

MALICIOUS

PDF

85.9 KB Created: 2021-09-04 23:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 22e24a538f10f5e97df764d0b66f51cb SHA-1: e97ed65e94027a634a37fb7c349ba0c9fd997a4e SHA-256: 1407d007fc455cef886c9b7a35361447a6d7b1195fa49ce4a187621e03705405
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious intent, including links to compromised CMS uploads and link farms on disposable hosting. The ML classifier and ClamAV detection strongly suggest maliciousness. The primary attack vector appears to be directing users to download further malicious content from URLs embedded within the document, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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 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 http://nonstopsushi.com/uploads/files/jamuzavomatidekug.pdf In PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835240068fe---sevojeduxevazimawelod.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/10020875512.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/56737803542.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/04b8611769d68e52a2074ef7b926feeb/jesujarajefofabojafuf.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/27674376311.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/jodarorudumase.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/25738811624.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/70805752331.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/dukumal.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/1kid6tjgl2g8id34uosehrlqm1/dixujasenisog.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/jixibomituzatip.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/xixojezojekenopap.pdfIn PDF document text
    • http://wallsfamily1912.com/clients/876683/File/45573711185.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51667c0cfa---14097693803.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160b2da7b8809a---bopafisexu.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/128183eb2cf438835c9009977650e4c1/litatudusufufalupur.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/ptlehggi258c88qhpk1jeir4st/zezoruxupa.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/nokofowuzeluwuwukitetov.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/pixevukeletamex.pdfIn PDF document text
    • http://ildong.org/sa_upload/userfiles/file/20210804152604.pdfIn PDF document text
    • http://turatabor.hu/media/7970093338.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=grade+12+chemistry+definitions+pdfPDF 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_off0000e68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68C 18748 bytes
SHA-256: cdeb7cda560ca34a2320c7fb5a0a55635dbda23c2e37be407f11ad4c2707547d
font_01_sfnt_off000117a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A9 11164 bytes
SHA-256: fea511ef1a62f8aaf65be424fa91654e62c42c67ad0882d24edb6f8595bcc972
font_02_sfnt_off000131bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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