Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ac2c3b5ae85f6b…

MALICIOUS

PDF

80.7 KB Created: 2021-09-04 14:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 67157daf54d62c34a6509243b1f752a0 SHA-1: 789e93bf98db3a98f3099e64f1daed8b12c11402 SHA-256: c5ac2c3b5ae85f6b8f50b68205299ca4041858a7fba1077e9cab8e13018b67fa
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The structure suggests a link farm designed to redirect users to potentially harmful content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://laborke.ru/uplcv?utm_term=8th+grade+history+textbook+pdf PDF link annotation
    • http://elijahlaurabishopblack.com/clients/b/be/bed082b287f5bb70db4763ab929fc18a/File/69124135131.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076db63895b2---jigelujiwugatomutuf.pdfIn PDF document text
    • https://gilbertems.com/videos/file/kusuxozuzab.pdfIn PDF document text
    • https://educhina.mn/editor/files/forigutonisufanuxow.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/sebirosidubuzigovizutixos.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/gedinuno.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16097c6b0b94e1---muziwilukefapuroz.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/b76b0faa8e789a17cccd2f29b598ba11/55552939082.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/53944230354.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/xekojenigiwewijomudi.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/63029720412.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4af40b39b5---tizosisenajejixo.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/baxoxivizexafutotuduz.pdfIn PDF document text
    • https://tipresentoio.it/images/file/jinebalitumadezab.pdfIn PDF document text
    • http://ipllaser.in/uploads/jomapanowenep.pdfIn PDF document text
    • http://namngonviet.com/user-/files/wuwukovivafob.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/3a5f91e7a2305ebd8aa990493d639ac4/rarojafubovimunokigomib.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90831617661.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa490a98c0---gubunotirimu.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/44857457119.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e8a2100a1---44923499606.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/vifuvegugogid.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/ronoruzofir.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/jovujikotoni.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_off0000d896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD896 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AD 11184 bytes
SHA-256: 4a3def5f7c765958de2ed429f9102ea40ceb555597f166435bdea6e5b65bb5b2
font_02_sfnt_off00010aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA6 16576 bytes
SHA-256: 81ec4e3f299c27850ade7c79beab0053756774f33ab5f80d1cee7cdfabe9d647

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