Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba682079f52594eb…

MALICIOUS

PDF

68.6 KB Created: 2021-09-29 05:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 68f7057d2e8603b586df9b2c42b8a3d0 SHA-1: cd3381914919280f8a4d710596a6adc55caefd7c SHA-256: ba682079f52594eb694d09ca89c0eb7a81abe67ef91bf536d5683be6f9327eb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to various external URLs, many of which are hosted on compromised or disposable domains. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics suggests a tactic to obscure the true destination or leverage compromised infrastructure. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://smidgel.ru/uplcv?utm_term=satanic+bible+pdf+download PDF link annotation
    • https://maxflowfans.com/userfiles/file/199936543.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/rilezezemanes.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/dokemu.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/pezemorife.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/46702440872.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/goborolisotilikora.pdfIn PDF document text
    • https://desco.scp.hr/files/7491425480.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/86962176214.pdfIn PDF document text
    • http://esistore.de/userfiles/file/48273162626.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/wupexekabekejomujaje.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/samokesu.pdfIn PDF document text
    • https://estoniapools.com/contents/files/6460983173.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/91222236240.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/fekodegafe.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/26318419479.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400dc3c4db3---63407029738.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/jaziruturezovasikalem.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/fojenasotipotoxif.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/basulir.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fbf6a92663---gawigiwumef.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/3974bbea091705844db2238e52291ac7/15794399684.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/sejagavo.pdfIn PDF document text
    • https://ratoempat.com/contents/files/90920423959.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/19880788522.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/21337242141.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_off0000ae75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68C 10648 bytes
SHA-256: 279a994854d352ec172b9bf00cf06304522c5fa35c26ba8992d49ae93d76acab
font_02_sfnt_off0000dee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE7 14636 bytes
SHA-256: 9dde44c1d6f6643976960bfc9fabe4a4a5a9cf8c0598a040fcac9d818dd61825

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