Malicious PDF — malware analysis report

Static analysis result for SHA-256 e28eb183fdb4749d…

MALICIOUS

PDF

89.2 KB Created: 2021-07-05 19:33:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0a7ef1a6e29c00bd7bfe87adeb368f8d SHA-1: c84d99e3b9d8ea4762bfb895afde62e15f801709 SHA-256: e28eb183fdb4749da2cc311e57bcc4236e3a645bf503ca9680442fe3c292a5ba
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malware. The PDF structure and embedded links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7171c8d8af---boxagabenobapiberitas.pdf In PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/b7h64ror3a7lgrmfe3vvkp65p6/28143090360.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd9da612f6---25796001663.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/1616731300.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe6787bce7---94940686865.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/gukuve.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/fulowitolozifo.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c26672f17---33624831716.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/f4ae433b17944b99d9a19228523be7e5/soxuwixovozetasavizo.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/padilujegimelajif.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/8gl7dgj710r2f2t4mmmvbng7q0/jifimo.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/voguwanalupeweva.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9478135e3---40343654915.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/19089900255.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb246042b50---nirowiwebolezus.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/7aba5133289da9095dd419c9e05510cc/bajemivusamibewenosipuge.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/b5e25d19a445101c4e66e54147a31892/tulopasilewijezemetu.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/98576550333.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/nunokowitopejamofivafifi.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/t2mp03anf87vobg7jdhaka5o2o/wegaboxiledobujipiwajo.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b817813f6e0---42809034369.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/44156252172.pdfIn PDF document text
    • https://dineflon.com//files/lofixefakelar.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ff61a59d2---12378842413.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/tk48rkgvpgfncirvifg1bqfpvf/53050775863.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/86231640578.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=free+sat+practice+test+with+answers+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_off0000f74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74F 10616 bytes
SHA-256: 5ef84aa1280e0208c11de9f4c32dc130979db5d14e0ed79ee768698cf8fc69e8
font_01_sfnt_off00010f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8F 18064 bytes
SHA-256: 4c092289d9742c094a3bc577b472983b3f01c579782c7138a7435a5046747b5e
font_02_sfnt_off00013f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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