Malicious PDF — malware analysis report

Static analysis result for SHA-256 f12aaa6cea565f75…

MALICIOUS

PDF

79.6 KB Created: 2021-07-27 21:41:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 573a92a594e2e7093d3b7a3b0db0da69 SHA-1: a3cd5147df0bd85a027abb95e5c8ba8f4f9c761f SHA-256: f12aaa6cea565f7531ea36d69dd6dc3cfc67d2366f57795ac7890d8d226ceeec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised CMS upload directories. The presence of a 'download button' heuristic further suggests a lure to trick users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mkngsp.ru/upload/files/88913091046.pdf In PDF document text
    • https://narimasu-chintai.net/jcfiles/file/fojigowuludotoxipen.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles//files/5090566589.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/9197dbba143c510db3dbc72816ce2e51/sibunimupado.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/poniserazupogazefi.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/5f64b75266df754c5d8a2fb0fa2e5e54/gizadutolajo.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969a05a1590---88083657937.pdfIn PDF document text
    • https://ovth.ch/userfiles/files/xorovaliloxepozuxexum.pdfIn PDF document text
    • http://xn--szabowski-tub.pl/userfiles/file/gisajiluduve.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b19c8919d1c---fobapedibefel.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797b3c1cc73---nazabok.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/52540296247.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160cff70f14e57---ditorosafefovonu.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/zetulikelewivudedu.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/66256129040.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/fudukupusagelakopodizize.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/bc46190fa309e6bb1957505d24e2a49c/vafuziroxitovudajukujax.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/6685627598.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16088bfd59ea4a---41890554589.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/36004706190.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/086358cb7319b5b2b7b6d4d6d7a9437d/90705128776.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/3e0aff4e2616d1758c0cf4cc7e5eeed0/zolagumekesuvekezafik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=nannaku+prematho+bgm+ringtone+download+zedgePDF 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_off0000bf90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF90 11124 bytes
SHA-256: 823880ed27680a0d3bf41fe68654fc71b5d63d78dcc105bcf494eb1adaaa559b
font_01_sfnt_off0000d8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F3 15900 bytes
SHA-256: 3050d41a72a54ea67df9db543a28d9784fa5eed2073def2afc6a5b52e8db3716
font_02_sfnt_off00010249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10249 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011a5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5A 16224 bytes
SHA-256: 749d0e0a2ebbce6e3a842727ccefc785b5fde86fcdd6c62922dcb2c91ea58cfb

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