Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b86d7ba10aa453…

MALICIOUS

PDF

82.2 KB Created: 2021-08-20 16:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 267186a11ec7ede807ee53255f3d3641 SHA-1: 72788fe22bd820a6a374b6cffb93f1cbcfefb52b SHA-256: 72b86d7ba10aa453d4e5480d6bf00e7ca046cb8c6ea12377a666886d483bdfe0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure itself does not contain readable content, but the presence of numerous URLs strongly implies a phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://philabc.ru/uplcv?utm_term=how+to+do+fahrenheit+to+celsius PDF link annotation
    • http://www.aportecnica.com/imagenes/editor/file/3090389499.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cbce33ab109bccd8fba13abd65e08ff7/85814749983.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/78752978791.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/56917647790.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071dab258448---ridulagovojamutefik.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/27646885081.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/86910413846.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/crji0dbpfklit90nnoa0ua0i0m/51235881722.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c25e6571657---vineroxinizin.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/mudorinomogapogade.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d9bbad20df0---lotizu.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/dapoteworotez.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/36686519825.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/15227221706.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/rokexojifadufetuxejir.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f69b3143b91---74729136353.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/b5faf015db9415b74f41fb7d23ec2aa5/69839026281.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021071304503980554.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1d7398f1e---pevuxenubelivotivupeb.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/42953372540.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/j5hi9a73m4m09fth8ujkj2e152/puvojijisujupumes.pdfIn PDF document text
    • 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_off0000dde9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE9 10752 bytes
SHA-256: 49a68611678025bbea7edd271156aba15a29232b40a0240f092036960ca8b833
font_01_sfnt_off0000f693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF693 17612 bytes
SHA-256: 761ecc8989de9d19d9f31c9dac09ee076480ee536f910aa394a8a3d65286024f
font_02_sfnt_off0001230d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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