Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d3f47f2eaa84a8…

MALICIOUS

PDF

83.0 KB Created: 2021-09-06 02:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 18d801fca46f8d780a506f2553d048b8 SHA-1: 2195f4411bd65829101cbc441a861383a52d3940 SHA-256: c4d3f47f2eaa84a85cee155424f1ee4ed4195b04af3ab46f83f6b09f88d28315
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous external URIs and links to compromised CMS uploads, suggesting an attempt to redirect users to malicious sites. The presence of embedded URLs and the 'SE_CALLBACK_LURE' heuristic indicate a potential phishing or scam attempt, likely aiming to trick users into clicking links that lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://queure.ru/uplcv?utm_term=cessna+182rg+manual+pdf PDF link annotation
    • http://wildzipper.com/clients/wildzipper/userfiles/file/38593131528.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/gq2pgsdlgoh303en3jqnsg6if7/21705516328.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/pegamujiweto.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c591e679b65---pesitifixasixolo.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/41421949237.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160969cf85799f---9395196510.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/7487542491.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/faninog.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/65771941204.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/4galiclng47i3fqmm694hc3r4v/nitevepaxegakiwumabak.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/vm7ociipia1sah01ihgn0khop7/45904194527.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/1621750365.pdfIn PDF document text
    • http://nccutrackandfieldalumniandfriends.com/clients/2/2c/2cea5a7e730406ee40dfbbde6098010c/File/88284375600.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093a838410d1---70312458390.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/sesigajusomafifig.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/82ts73716na9eungc718dalfr1/xaviwajovisinidav.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/nusifof.pdfIn PDF document text
    • http://fairmonteast1975.com/clients/0/01/014dde3c838f86fef2ac1d31a86c415b/File/derasudatozuzapaguzejube.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d07c1c9cd---11520756587.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/23237261450.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161183237ee317---53878246770.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/redesesa.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16075ba78f29ed---47624533988.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/cc5573a0ba6d5f60dbec9a211895746e/33177049113.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/j2dejbl97kkihv8qoi0q3li22q/92757633994.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_off0000dd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD96 11044 bytes
SHA-256: 88ce02320f5bb1365dd4c42e6bcde6a847bfca41bdba44c89f54db2b712203fe
font_01_sfnt_off0000f733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF733 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F45 18220 bytes
SHA-256: f971e21313dffb793a08ba788a4db458a7c33026875f0d8c087d85fc87fdf8b5

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