Malicious PDF — malware analysis report

Static analysis result for SHA-256 8daa589147cce351…

MALICIOUS

PDF

83.7 KB Created: 2021-08-04 08:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3d79169ef734235299f2ed4e0acc95e7 SHA-1: 930330bf4268d47b3ee6cfbab105aeeac0d05748 SHA-256: 8daa589147cce351a9fa3e1e9bfef0087455a0e5981da3b611c7c9013f26d50f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, and the ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the overall structure points to a lure for downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/g4pitd48ngeidurv15lrg9gs45/51431732582.pdf In PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/fdef9bf428b485de034c314707a2f0a2/xisaxazixumakufutinifol.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa85ab8a5ac---rididugar.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/banakokijojanixinirerij.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f1042e6a2---48336236053.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/fexilasimusuroxu.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/71625844573.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/3m93tmu9dniqjhu0qrf0bt3es9/65342611320.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b34ecd90a---72416029188.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160947e0714fe4---mutovezotigoz.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/botefazosupuwir.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/54204938297.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/7mp2ncijg8iej5jce4ildf1g45/legarobazewinefejom.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210605155955352.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/gitorapediloluxajimibikuz.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a85b1f6c0---45723479021.pdfIn PDF document text
    • http://darec.sk/files/files/mezala.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/kifiwuwinebakelu.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608955958407b---39387750821.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/96754028598.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/19981996877.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/96467985416.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bd083c372---39145038254.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/aaaf013c89242408106a49ef53cf7f63/pelozoriwilesawi.pdfIn PDF document text
    • https://kartplast.com/resimler/files/87451191350.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/miraxufewosiza.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/joxuranevaxopir.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/22928234589.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=pdf+to+word+converter+free+download+full+version+with+crack+for+windows+10PDF 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_off0000df75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF75 17184 bytes
SHA-256: 364143d575f55ac6e285309f69487c217fa412be277584fd26338a5fba2bc43c
font_01_sfnt_off00010c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12437 11092 bytes
SHA-256: cb6ed54f61ccb8a15ca5c65bd28780723f983931f53e262e3ac378229fce7b38

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