Malicious PDF — malware analysis report

Static analysis result for SHA-256 a882e52f5a97904e…

MALICIOUS

PDF

93.3 KB Created: 2021-09-14 03:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2341b3d83089387cb5023f2ce0039505 SHA-1: 25a1471ead53968ed4a60eb0651b7a7953b31071 SHA-256: a882e52f5a97904ec8bc96ac14ab1efd67dd826d10c2b71e6d693e0efa34ace5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm, directing users to multiple domains, some of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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 http://zussobrance.sk/grafika/dokumenty/julofusevevixanux.pdf In PDF document text
    • http://hexindechem.com/upload/files/fonuxijuribetif.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/58750276908.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/84837793268.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/vemazuxoniraduriboki.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1cee30417---30918222427.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/56784851698.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/wugerem.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/15963246045.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/jolan.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/4009de35501660e5ad3e9a98d94ee823/35658804367.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/loxujowiguzedoregobezexo.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/jivito.pdfIn PDF document text
    • http://kht.civilkozpont.hu/uploads/file/42554688288.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/kijewogulum.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/88443011613.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/50025ddb3504a99097ccd16acf7d9a03/70337193753.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/70924554311.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/rupanusijefekuremibenevem.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/buxesuga.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/25291894462.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edd33599be---53150580769.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/jegatopukatatiw.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/xukomumebididaga.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/femevimekodezaxule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=minecraft+1.17+download+for+android+cave+updatePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE530 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD47 10856 bytes
SHA-256: 40d8e3f71c734b135e024ff178d8a44eb818544b20ef79bd16b7bdba69234cd5
font_02_sfnt_off0001169b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169B 22392 bytes
SHA-256: 72bb9caa9b1557836584fa9e07a3587610214936965c087ffd35bf685a5da110
font_03_sfnt_off00015071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15071 16232 bytes
SHA-256: e06ebeaa2bb94d9bf14337b0794fec2c9c4a66e30291689b6f6234bfe360c8a5

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