Malicious PDF — malware analysis report

Static analysis result for SHA-256 c821ddae594f1351…

MALICIOUS

PDF

89.7 KB Created: 2021-09-04 16:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7c5617c534d26bd2c2c1b04220bfa3b0 SHA-1: 136e49d98c064f3b26084a900b10fe01f00aa581 SHA-256: c821ddae594f1351325f0a52a9c4228371430d4575aa6c66fed995e431323a3b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content or submitting sensitive information. The presence of multiple distinct hosts and a high number of links suggests a coordinated effort to distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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 http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161054ca99feaa---juzotifasorogafut.pdf In PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc45c45e40---39260139304.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/5db794c29336749b238427d3661cac26/14292365578.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/d7f668464b2887bfafd4787b63ba9737/xukelim.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/57462300639.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/wunopijowabuda.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606da41575b0e---39626725884.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f7281a115---vonosebivitasuju.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/632729080.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106c45fed979---bisatozapoza.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/3090154649.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/64033581544.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/40227565334.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a244e42ebac---kurisago.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/20459261941.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/m4fv1n43uu925s97ri4pbc3m12/davofozomokebep.pdfIn PDF document text
    • http://rowanfamilyreunion.com/clients/28915/File/nuwusaz.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863381778ed---mikapajuporig.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/dejukimigekudaliv.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/mukejoguderojedezet.pdfIn PDF document text
    • https://33mobility.net/uploads/files/59350867835.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/wifatepokufuxuwenid.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/13718267632.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=cisco+packet+tracer+student+lab+manualPDF link annotation
    • 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_off0000f6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F7 18828 bytes
SHA-256: b3477e23bdf7a0f3c5079fecc3fd8a5ae6afec247eec5ddd888fd384222599c5
font_01_sfnt_off000127f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F2 11036 bytes
SHA-256: ff26680394db0c67fd3ec929c70b68bd91e8b96335745501d40a9d4abef5310a
font_02_sfnt_off00014171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14171 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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