Malicious PDF — malware analysis report

Static analysis result for SHA-256 a19f9dd0a40d38e5…

MALICIOUS

PDF

88.1 KB Created: 2021-09-17 00:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ce19ade76511b2c55033d0d2ba85ce3a SHA-1: d597a63045f05c23a9e6c535116853167f8de3f9 SHA-256: a19f9dd0a40d38e5bc3433e65feabe2fac3e18dfa168a13bf99c4d9de95b4d43
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external resources. Several of these URLs are hosted on compromised CMS upload directories, suggesting a tactic to distribute malicious content or phish users. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics strongly support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://zahrek.com/userfiles/file/kodazutu.pdf In PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/45170609268.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6263eefc5---80034395671.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/24497924922.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/jumizanora.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ff472b6f9---lesesitowasifotag.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/7808460583.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/98c2d84dcf1a8455d015973517766242/56481797996.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/gixofofomux.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/85325057395.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/28938733973.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/40065182889.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/waweso.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/37870734282.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/78009041038.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/60067000883.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/74052711927.pdfIn PDF document text
    • https://quizai.com/uploads/files/81928323656.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/fudusiwuse.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/170505394177.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/vipojuzakejibaden.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/60842656366.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/30173039097.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613332b6c5f96---pisux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+can+i+make+video+calls+on+my+android+phonePDF 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_off0000f330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF330 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B47 11032 bytes
SHA-256: 2030f46ebb62fc039c1600a6bbdf60380caa430c174777d7063aeb13e29d3aa5
font_02_sfnt_off000124af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AF 17600 bytes
SHA-256: 1a4bd0e1f19153b3b8d60e07c07f80f69326d8406b9f6d68494246813002030f

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