Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff1df2dd547154d3…

MALICIOUS

PDF

114.3 KB Created: 2021-07-22 18:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: d41485155058271cb1716b42fe28a743 SHA-1: 26db053c31a16a5d4ddd869b35a52f0c851f927b SHA-256: ff1df2dd547154d37b142100c8f4f5fe948824352bcedee4450689778d5bd8d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure, likely leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9852

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 https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/ranmhoe7mbrmhdk24qra903fg2/lenoxuzedikazera.pdf In PDF document text
    • https://alarrabnews.com/images/content/content/file/mugusa.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/sakozar.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/38563617914.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16075ce197f4de---42684154556.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8d38be32a---dodutojedelala.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a637492a4c6---65904414463.pdfIn PDF document text
    • http://juentai.com/userfiles/files/jejojoxigopukavabizax.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f7e14e413c0---gikeresunixij.pdfIn PDF document text
    • http://banquat.com/userfiles/files/misus.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/saretojazopumokibiv.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/d7feaa2f42d69bca7549fee24748adda/63585907752.pdfIn PDF document text
    • https://plasy.com/uploads/file/palatiduzolomovarunegija.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b1ddab0192cdae29dfb9e7a7e89a5515/68090429368.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/999d8ab69fb3dff2201054a3ae3d05dc/kupewulakexedut.pdfIn PDF document text
    • http://wecareprogram.org/images/file/11634549316.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/77832614384.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/dalipifu.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070306ca0af6---zefapeponugirafemelevave.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f21d9b6167---wejafepuvokekizoj.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce10dbe51e---74850683147.pdfIn PDF document text
    • https://loctra.net/userfiles/file/9983675064.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a195f21c67a---92370040182.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5e707049a---7799869129.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a11f38b530---65190938743.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/japazidogomezitu.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/61496728615.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=download+bootstrap+admin+template+freePDF 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_off00015de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DE7 16460 bytes
SHA-256: d8dbdd76406b99e4f257fc7abbeb811e21ff1c44aee6a8bb73e50366cb09df58
font_01_sfnt_off00018897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18897 10888 bytes
SHA-256: aa11392e64fa13186626d9db0de51491fea952d9e577bbb2d65ea74618f3d121
font_02_sfnt_off0001a194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A194 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1