Malicious PDF — malware analysis report

Static analysis result for SHA-256 11457cc16ae10252…

MALICIOUS

PDF

91.4 KB Created: 2021-06-26 18:41:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c1266bce4e6779569dd4b3c2e1d3e7be SHA-1: bddeb007033aaec46c4ba8236d7bf9d74f9bb0ba SHA-256: 11457cc16ae1025260bb0802f41546436339b3e47fe73b08f8b37655d5cb9351
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious files or redirect users to phishing pages. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification confirm the malicious nature of the file, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=gta+5+licence+key+free+download+for+pc PDF link annotation
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a80f6f76525---titogokiwawesusokamukeke.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/xowumefodabijivo.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0ad162207---xuvabebiresexipisut.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/e0e0a26e126adcf5040df85af4ce3ee2/59044255019.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b3e7c6016---zuzivemafidulobamuriwiki.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/f521d3bb677df1aca74b59676338462a/9115919536.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/7qo1se3o6bdc0579dsc5lin4gi/88081224516.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/mejexegebevajupasepaxivu.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/mazasolipaxig.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/sodok.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/devekiseminofa.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/d659509e9ccbc5e906d4a00ae4215224/labegesoxemigelakudawud.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ad3217886---53753855076.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac0864ccc0---92201986073.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88545f2463---20716649408.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822f495e231---26385867987.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607917225c021---xolewodidige.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/8m1rpul95bud48hisdlfddgqs4/85648720607.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/0ib37l37ug81t2bvcncvmld2cp/19350372448.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da2bae8730---jewogaxadipimobex.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/877bc09e5d87a70a1827da352b12bef9/65386548412.pdfIn PDF document text
    • http://dentherapia.hu/files/file/38496832324.pdfIn PDF document text
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/jonugelu.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b64859373d---39818855456.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/c244226ddf5fb3acd3e4fbb9fecf4a19/nevuminegalozawirelirera.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_off0000ffc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC2 17140 bytes
SHA-256: 9591d524801384365117b4d86c3c52779beff568dbd75913166110f6988dd4a0
font_01_sfnt_off00012cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144DC 10908 bytes
SHA-256: a30aa7f908de84b77ee76afb63117d8017642667ada3262df5463856d371e810

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