Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3fbaaa4f49a627…

MALICIOUS

PDF

78.8 KB Created: 2021-09-20 01:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 88f0a75f10c0a2a93cbfd950cc2fb911 SHA-1: c0745758180e16bac9a36c67157187703f7642fc SHA-256: 9c3fbaaa4f49a6277f94a861f4cb180e0d7b25e679ba8c94b0bf5ba6081bb89e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ndt-tl.ru/upload/file/16428337221.pdf In PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/71987019128.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/bilukotuwibudowaf.pdfIn PDF document text
    • https://actorconseil.com/files/file/tavuzatosogibofudumaj.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/2d5d4c94387d226f3508362c96d9af44/dezuxusirisubijusifabo.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/13196944057.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/mewav.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/44264359988.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/jifalelenaxi.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5a67803d4---rugilevagagokizuravabube.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/zelubew.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/zinavazufatolat.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/1978354739.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/pidujuzamepogafuvibezugix.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/52b6022285e1c149a1acb5132b394e01/puxuzutovibutaxo.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/bogexod.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/juverapitunoluj.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/82170075516.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/5025291334.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/juxilikurone.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/vomagireverijimafafigob.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/fidanelirifaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=brickmaster5643+free+robuxPDF 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_off0000cb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB32 11384 bytes
SHA-256: c46015e2d8aede3f1d79a2860c79947b45ce62b849d24b7439a048be77d71b8f
font_01_sfnt_off0000e63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63A 18396 bytes
SHA-256: 9a3878757b3e25a1504b460fae3a806396f185c309a3bb72b1df21722d820797
font_02_sfnt_off000115c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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