Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c8537c95bd71f3f…

MALICIOUS

PDF

90.3 KB Created: 2021-09-04 07:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 357188363131be04d3b8f7b0d43daf29 SHA-1: dcd74332b9e66253707913977d6784d3333da2f2 SHA-256: 7c8537c95bd71f3f5e91d1ef73a16d83eb77dfb5649aeebdcaad3a92b0385f4b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised or disposable hosting. The PDF structure and embedded links suggest a phishing or redirection attack, aiming to lure users to external sites. The presence of multiple unknown reputation URLs reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://joy05.com/_UploadFile/Images/file/53315261871.pdf In PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d54e78652---petaxuxaxawifof.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/wirosivigiwonekadezan.pdfIn PDF document text
    • http://gotween.com/userfiles/file///1531316406.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/nigomisowolag.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c35cd5d515---30398828734.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/wetiw.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/fixubupi.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/61451548400.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a768703ce92---gufotogipedebavifaferipal.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/23558088774.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/fa2af81b127a3a718a9db44eb137b766/gikuzulodovebu.pdfIn PDF document text
    • https://aneri12.eu/res/file/nugixejidawovegorebiwu.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/59682246331.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c568e15e63f---49823781631.pdfIn PDF document text
    • http://isgsrl.it/images/file/43036968792.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160dc3887239c4---88552596029.pdfIn PDF document text
    • https://apra.pl/files/file/dagopebujelopur.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/bd3babb6dc7ab97dfbddbbe403d9e72f/70014015176.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e634932a5d---peselulad.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/nitroiqkhfa47legce8rnmc367/65904055308.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/wekofinedexetuxe.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/51859847790.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/somuzefuwod.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/62598668979.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=fractional+distillation+of+coal+tar+pdfPDF 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_off0000fcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C2 17936 bytes
SHA-256: d5cc5e3968742b2d899a5076376566d7e7d4a35f3ad2ad6a80fdabb8a683da45
font_02_sfnt_off0001433a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1433A 10456 bytes
SHA-256: c1782b5728c83c5e0bc765e022ed18eb46300a28a5ed920000b96d1b6a571359

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