Malicious PDF — malware analysis report

Static analysis result for SHA-256 121fef71d47b6302…

MALICIOUS

PDF

85.7 KB Created: 2021-09-19 05:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7fb24eb545a1b63e82096a924e222622 SHA-1: 95c60fb98705f2e0fed67f34385f75c33edb518c SHA-256: 121fef71d47b6302462a29ecef8c93baa95baf7dbfb739c79cc068153df1fa3b
196 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The document's heuristics indicate it functions as a link farm, directing users to external sites, some of which host further PDF documents. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document's purpose is to trick users into downloading a password-protected archive, likely to bypass security scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=how+to+unlock+a+android+without+the+password PDF link annotation
    • http://bangladeshceramicsociety.com/uploads/editor/files/milekevusopafu.pdfIn PDF document text
    • http://meskerjager.nl/media/files/roxakobowuzuketoz.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/pupuvoxobi.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/xivesibubasaretoko.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/25370213222.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/linanexavuzirituzobijixuw.pdfIn PDF document text
    • http://mfahk.com/upload/files/zonufijuropigunokokojeka.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613081a866ee5---25096530322.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/43422263335.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/20623758853.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/18085872767.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/letakutexewug.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/kovafotikebira.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/jukaketozudafidezazakebo.pdfIn PDF document text
    • http://nincity.de/inline/file/vupawetok.pdfIn PDF document text
    • https://andhimazhai.com/images/files/75914669097.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140524d1c68a---vuruvurufugesajaxafisemem.pdfIn PDF document text
    • https://porfic.com/fotos/file/luxusedolekamadanoju.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/16725319480.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/89131001371.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/wedusagonuziduzusudi.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/motukekukovekaxe.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/26906711856.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/fataluselefas.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/1lbheq1u1iffbh36qvu532hrq4/96807427692.pdfIn PDF document text
    • http://strap.sk/uploads/files/33570719303.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_off0000e6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000feed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEED 10880 bytes
SHA-256: e299072a9683fc97803d0ec5afaadf8dbba55a52a83b4ffdd84ef7ea3d4678fb
font_02_sfnt_off00011804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11804 18648 bytes
SHA-256: 1848fc825980dae7b83b5a3d41f87ece323231fce55276fcf93ef8ebf6b3de91

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