Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ad65e468086665…

MALICIOUS

PDF

85.6 KB Created: 2021-09-22 12:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b85cc99cc10a660d1fb3e284e890fdb1 SHA-1: f8064461eb3929538d1f9f58beac9389e187bb6f SHA-256: 16ad65e468086665824a32603624de33d16aca8330306d9945dda4702253c29f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure and the presence of external URIs indicate an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://gpshardorawal.com/hemkunt/userfiles/file/89961285640.pdf In PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/596041321.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/fepeme.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/bugokoz.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613568393a378---putejakuwiradafevojibake.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/38201373795.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/74057089405.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/shi5nevmegh5urtv7tdnn31a94/98483492925.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/81684979708.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/76031343001.pdfIn PDF document text
    • http://rentator.com/uploades/fckeditorfile/88694568906.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/15288405302.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/tofedifijuwuwalov.pdfIn PDF document text
    • https://hse.tw/upload/file/11321023040.pdfIn PDF document text
    • https://tch.lu/files/files/pamegutawevowanivibusi.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/makowurukilorugawe.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bec5f4aa0f06f85f5e414dd3663d15ab/jirupuwidaxoge.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f35213d037---xejebisig.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/zexera.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/68324799826.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/salufuwaxul.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/50932319169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+press+enter+on+android+keyboardPDF 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_off0000e5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F8 18804 bytes
SHA-256: 79c36aab068ae6c4ff48df50879f92e35729808726e3fbb2c3e147bfd6f3c431
font_01_sfnt_off000117f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F3 10760 bytes
SHA-256: c178c6ba8d7b6cdb50b34c17fffd575bb4c0af6e7ad7d8293ce2cc42ec0804ca
font_02_sfnt_off000130ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1