Malicious PDF — malware analysis report

Static analysis result for SHA-256 95844b5b18b13cfb…

MALICIOUS

PDF

90.4 KB Created: 2021-09-08 09:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a8b8fb4c463ca3abb265485811a64dae SHA-1: a96b67c77e2d32b50ddbeaf3d16d3a87c273d6eb SHA-256: 95844b5b18b13cfb9f67a65a69d2b9143d308c4c68126a0da9bdb233a98ecea1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://yz-yongzhong.com/upfiles/editor/files/65326074346.pdf In PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac794cd7b51---93692519883.pdfIn PDF document text
    • http://bjjiffy.com/upload/mikobizarajo.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/n2eq15pq5fod9qbri2561o58u4/34506795401.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/16583535674.pdfIn PDF document text
    • http://poliinc.com/upload/files/zokax.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/ripukamajemukadizigapisep.pdfIn PDF document text
    • http://knipia.com/userfiles/file/95567671687.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c82154586f---detuvikapojuzibelodezor.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/90597495299.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/logogeferowuwebefobeje.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/3d1515898de8a16ba1c95f45f3fad7ce/kamemivizotamodakut.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/79957164576.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/waxepivir.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/bb470454af58fd1c62dc0f8ff3b19f66/dufanuditawubuzas.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852d11bc557---41139068796.pdfIn PDF document text
    • http://viajesalaos.com/webroot/img/files/76617679019.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/82562288280.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/fopazizas.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/08929f48532ea54da03abe77d7956e16/judiwomugiben.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d2d601e81---39003320866.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/safuwirogikupoki.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/43bc406b102b5930089858731433c7cb/37833437428.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=neumonia+atipica+pdf+medigraphicPDF 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_off0000fcc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D4 18080 bytes
SHA-256: 03332f7a3e35c0a5b9cac291e89a1afdec8636c0f11aa8238538cc09b7087ed9
font_02_sfnt_off00014399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14399 10932 bytes
SHA-256: 4d51c28c3463de235a7fd2f5aecff87fc359334ca23a25b587c889f5cdeca10f

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