Malicious PDF — malware analysis report

Static analysis result for SHA-256 1389c23548c35f70…

MALICIOUS

PDF

87.0 KB Created: 2021-07-07 21:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c9359ddb480852baaeab8b6e20dee611 SHA-1: 4bb8c961fd04d4f5a562c93d266cd4748d718dae SHA-256: 1389c23548c35f70a5690614ea5b735967804a86acf499c6d5d90ea4d9b068c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous domains, many of which are hosted on compromised WordPress sites or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or redirect them to malware. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbe222034e---48997979118.pdf In PDF document text
    • https://tappowine.com/file/tefofejaxisufawuruzemuna.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/20104354975.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/4081c3fbc0d22b79ff7b66b981e6914f/90707025496.pdfIn PDF document text
    • http://charivne.info/images/file/suledibujugero.pdfIn PDF document text
    • https://warungmimpishio.com/contents//files/79735667342.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/a335e818d1259765d9f730df0c76d2c1/xinuwim.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/b1790ebb170f6b7a83d0a1661a2ea73e/zowozasegetisuxej.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc4a1e1d9a6---39850321391.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/zelusujodi.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160944794261cf---wemozisiliweburafafakeg.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/kidosejavogezawozuzij.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/23602706153.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/7balsih9tapgdr46r5eh0mv69v/gupifujuwakiguxejizisitek.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/ddfbd64babd09b447e774adbf07f13bb/mowaforunin.pdfIn PDF document text
    • https://termoformat.md/img/files/pusozubodiwipo.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b907f37422d---wafixedifaluguzinij.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38fc591a27---xabusunefife.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/9e2a01f49b8658682d329429fa1614fd/bonif.pdfIn PDF document text
    • http://agro-partner.com/Image/files/42811144521.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2053cd398f---12341376899.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/4c7fd37f3ee346d77d33a08d67cef7c9/vevikilepatomamibomume.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/rokibobebe.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/takavunujusixij.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b144ae04602---ravapowexixofosap.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/468e76a73bfa782b023b8eefa6226220/27428850082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=plautus+and+terence+comedyPDF 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_off0000f10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10921 10656 bytes
SHA-256: ace122596fc64ccc6112c085730524e4b46c420a33bf84d5bf10f4bad328d7b5
font_02_sfnt_off000121a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A0 17532 bytes
SHA-256: 2e8ee2be2e10088ffc9467bfd022a921ee6df1eddf721bf3d9d2188e8a523a33