Malicious PDF — malware analysis report

Static analysis result for SHA-256 a580b21d865f514c…

MALICIOUS

PDF

116.2 KB Created: 2021-09-04 04:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bd517e73fbbeae2d79810cacf727bc2d SHA-1: 8cfd8ee2ddb219c2e2873e979487ff81d3b33480 SHA-256: a580b21d865f514cdb1ef38cb02cbcdda72c7e5b2d2977d4beb5a675d17f3652
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm pointing to compromised WordPress upload storage, likely serving as a lure for phishing or malware downloads. The embedded URLs and the structure suggest an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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.
  • 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://nomylo.ru/uplcv?utm_term=descargar+comic+marvel+zombies+en+espa%C3%B1ol+gratis+pdf PDF link annotation
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e22877c3e---masijudubudaradosozovalux.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/b0599b6357d21047543d34baf45d3f39/46982315094.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/74585193525.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/9aa0db90ab014be50dd71e3e5794a3ca/48287743570.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cb0b8fadc---2540094628.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/af38452670ae5e8e3b213694641ca25a/zepil.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/zedubowogakelimi.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/95403544884.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a886a5874---19597312446.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3c55da7b7---dusekadazafilowixevaro.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/81436373472.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/48519011884.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/67903653938.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/41823333533.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/43600738804.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/zowinojujojeretodago.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/cc3e05864df10f4dd228d5ef739d490e/72236360146.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/bd0c0e9570a1052f07f7cdde177ad4ec/66551220658.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/pujis.pdfIn PDF document text
    • http://normel.org/files/upload/file/famujoxudozenupibelejer.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098aed37fe81---nijofadadipigonamilet.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7b7ad049e265f0a6f35fad0b3c72aaf3/gokivufoxukasawemif.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88481821846.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/b556837049163a4cd81fa0c25e107da9/24656557451.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072c28de5054---dekax.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/b033c47432d07df23ab636ad47bbc526/70707930478.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_off000158b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158B6 11436 bytes
SHA-256: 04e77bf130033f122574cecb3b89b654d5cf38680ec82e32e3e87ec8ccf428bc
font_01_sfnt_off0001731b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1731B 19752 bytes
SHA-256: 9b3a811decfbd4431e297026615bd88923d2e9a8460ac7ec5910d74a09d5b86c
font_02_sfnt_off0001a726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A726 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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