Malicious PDF — malware analysis report

Static analysis result for SHA-256 aabe18fa22a13daa…

MALICIOUS

PDF

87.3 KB Created: 2021-09-18 08:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6a5b3c85229e1a7a65fad16c5df652f8 SHA-1: 9177410a44e731b2c8e32d19c79159d31741646c SHA-256: aabe18fa22a13daaeceb0d64ea7d2a6821e87d921ed2785c4bc9920b2f51275c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload locations and other disposable hosting sites. While no scripts were explicitly extracted, the nature of PDF link farms often involves embedded JavaScript to facilitate redirection, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133161071c05---nomiwifudemijavigu.pdf In PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613835adc4566---lujiwopeluweni.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/ledaxijodavan.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/59300082767.pdfIn PDF document text
    • https://photofetimages.com/bewawevisidupejefule.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/47726885598.pdfIn PDF document text
    • https://btegypt.com/file/4924864241.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/jazuxuludowozim.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/97247958090.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/34944843529.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/satotuwozifozomirisonupup.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/gezevolesojikox.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/20764418776.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/tedes.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/pemijivisulakomevuwizeda.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210916_03806752A891F82D.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/99179415211.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161410ef350cc1---difuvidegapumi.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/bivosilobubeladibutovozaw.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/10075757916.pdfIn PDF document text
    • http://khocabien.com/uploads/files/57556741818.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/womunagajagikesofirazal.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140cc60d9d09---xuwokatiwumari.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/pazugizedagika.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/lekewamalutifofegukuwonu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=escape+plan+full+movie+englishPDF 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_off0000eeac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BE 18460 bytes
SHA-256: e990be5cee761c338eb25c9792e64c7e58a793e3a3ac1d2aec86e7c0b24c28c3
font_02_sfnt_off00013677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13677 10880 bytes
SHA-256: 3e5d27287a8981af2135bd05494e30d97f974907a3a32e42247fc9e57b2a997b

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