Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b4c9ab63676664…

MALICIOUS

PDF

86.2 KB Created: 2021-08-23 14:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: d049a760dbc642832515f635da4dd4a8 SHA-1: c7ebc67d2e49a9fc6f992dd2507b2924a4d6e81e SHA-256: f3b4c9ab636766643b0b90f94a236e22a2d96c44a1e33a09a593e717850e1b44
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://pistant.ru/uplcv?utm_term=free+streaming+justice+league PDF link annotation
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/92f7648be435f935c88d8f649c8d35ba/85512081389.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8ff71992b---41237877136.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785a8a80b2b---23987923028.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/munofudapevudisodadepibu.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/regajazitabunotemotarako.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/93879911240.pdfIn PDF document text
    • https://shidoremicrosys.com/media/sebuvomik.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/sutun.pdfIn PDF document text
    • http://essuances.com/ckfinder/userfiles/files/damobugoduzepa.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/a14dc7ed91a8e2bb1e92d6963737701b/gigebulobipebebeloke.pdfIn PDF document text
    • http://primavera-bio.cz/userfiles/file/50974298749.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/24d5fdf7424f11e1213d16483b67894a/gudej.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/leqecq48vs4msbcb7u1mjaoti1/venarigekivaxawepuzawa.pdfIn PDF document text
    • http://esistore.be/userfiles/file/kobilusarux.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac14238211e---dagilutixufe.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/2413c3d77b52b5114433326aab1fe1e7/59124356723.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609499866345c---bokademonenajavifu.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/94595752010.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9866d6f0b---81404119528.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/18330800802.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/63294caf8bd6d5d640b79837b2322ebc/6318597853.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/f03cca19938085df11c9157e9762e691/70708707604.pdfIn PDF document text
    • http://phs1961.com/clients/2/29/29da8dc1278d8f1c58a3d16208bcb4e7/File/23494855133.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210726131123.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609edae93ca14---runezidep.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/9mpdbmhcvvqtab677to2flfss6/33581285905.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_off0000e95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95C 18288 bytes
SHA-256: 64409254045421341498115adb834f7c77bdde5ce8be31e2901df86850410551
font_01_sfnt_off0001190b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190B 10660 bytes
SHA-256: f32416ba877d3f9ba7a2ce94c368dc41fcfaa632bf2b3a826a58944c01278786
font_02_sfnt_off0001316b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1316B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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