Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e3f52e2035275a…

MALICIOUS

PDF

96.9 KB Created: 2021-09-02 13:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cbdb5d10ca570af0f07157585ce7d94f SHA-1: 22aaa4ca9f28c55d3c84e0b118408125d81f5988 SHA-256: a5e3f52e2035275ae38141f3788bc30a8be2caef1b4d62c4720c372ab04772bb
164 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of 'utm_term' parameters in some URLs indicates an attempt to track user engagement with lures like 'principles of marketing 16th edition pdf'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://huntic.ru/uplcv?utm_term=principles+of+marketing+16th+edition+pdf PDF link annotation
    • http://otoozevran.com/resimler/files/97092306049.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64a77eb3c2---lomoxawivixap.pdfIn PDF document text
    • http://rapet.hu/files/konaxexeriv.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160985c749a307---nejugubalosasiwunorakudur.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610531557640c---wadixosutivivejojiluzu.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/ab33f71e22d2c87b45ac711bcb1e88b5/nuwoseba.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/45578258421.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/82548943236.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f49957b052---tapudonedubifefa.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/4534d744f7c77194eee3828ff57abe5b/desesonomozijuxemivefosib.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/68663411359.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/dunuboteninadefixo.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/47eb5f660061e9fefc980fe18fb260a8/jukuninaluzidarubuxe.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/mewiwam.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/60836388685.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/ladibipufi.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160817d7d84861---ladivuvusexa.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/ch00jl255tsje4t165lh076sje/fobegobefarewovomilot.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/wosexiwexotojenet.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/26831761003.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d5b5a13bc---wijuradusizopinoz.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/c02lc2b59q985c7cg94arc7rss/72481600764.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce54e76aa7---88875101435.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/e72fc55b6e804559cd65841aee9e1ced/64590568459.pdfIn PDF document text
    • http://mopron.ru/upload/files/95652685679.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ec36c2ec5---tedawevorukinogifu.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/75109755543.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_off000111a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000129b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B6 18956 bytes
SHA-256: 12b955565efd3c779fd27ba8c540b31efacf945402e8313067d7b1a422fe7389
font_02_sfnt_off00015ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AE8 11380 bytes
SHA-256: 4ccfe7d8048ad4fbc178b8935bacec1c13b81bc865c4eaee2897df6d0d68db5c

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