Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbc4acb67fe5fddb…

MALICIOUS

PDF

85.4 KB Created: 2021-08-16 09:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 49dd84e01b92efba7398ddf9c539e28c SHA-1: aad50426f0d7f4fc27a9a5bf64ff9255caa4ed5c SHA-256: cbc4acb67fe5fddbf7e43efa346ce6f0e2f2516eb6287dcabb6eae0e304c6a9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://inwebjor.ru/uplcv?utm_term=how+do+you+apply+icy+hot PDF link annotation
    • http://gift-founder.com/archive/upload/files/zexetoniluwapotawoj.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160784fb720781---95269587501.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/bd48c2c1c846881855c9201b68dbe6d0/doxeg.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c962d8dec4a---gilanakixiwufemid.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/aced77b328d08cc0978ce5d5876e8f98/70863031904.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b0658384ef3---ferodiler.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/pugalirogujo.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/f26lmg12ch2usltvj1roh96id2/42092596955.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/rejinowi.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b5644aab9af---fonozosoxasezewokafibopum.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160f7993469e40---vesipotop.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/29273782679.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/40284686881.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/2415966454.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160806270147cc---denukarijixigubo.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adae4d7fce1---mozopeso.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/88379728334.pdfIn PDF document text
    • https://ckmandarin.com/uploads/27897759182.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/813772e4c2cea61a903b38c82b8d41dd/11635949882.pdfIn PDF document text
    • http://chieucoingason.vn/files/90766089628.pdfIn PDF document text
    • http://goref.ru/files/file/31347764946.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/86925747183.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/78021436692.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210613_8C6A998B8F5CC29B.pdfIn PDF document text
    • http://tmfconnected.com/clients/6/67/67cd703e63b47da0cba1438f70967d25/File/73466563738.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/rizaf.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/49604373823.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_off0000ebc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC5 16852 bytes
SHA-256: 9c10c102a205e6bcd05c8ae2c02d6e45c432f54c01553d93718f1dc310687b4e
font_01_sfnt_off000117b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B9 10396 bytes
SHA-256: 3fa0014e999e4371460b210bc0f0eb9734bebb6e84cf44fade2ae85342bc9c47
font_02_sfnt_off00012f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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