Malicious PDF — malware analysis report

Static analysis result for SHA-256 67925a7b94a03de4…

MALICIOUS

PDF

110.9 KB Created: 2021-07-18 06:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 5dbb73967144a84d2f6ec9043a811f6e SHA-1: c8a984b656729f6a814aa956b387c5ffdb19fd0c SHA-256: 67925a7b94a03de4b34f28d0b18cb233f9561b9dd3b43546d91fc2d8873e6bb6
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Static analysis revealed it functions as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to potentially malicious or phishing content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://fzsvybbs.at/userfiles/file/14123164955.pdf In PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/mazazakeladofu.pdfIn PDF document text
    • https://businesslife.com/content/file/86149436626.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/vilad.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/79088919836.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862c2068852---dirawifobixet.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/buvoxuvelipamawuwogerepog.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/63e2e0cf0a06a298e7feec562a823707/sovozaviririni.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/wikapalivutoweseme.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/19466683949.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/pozubulokozelokemutuvabab.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/1f7c8a5a7afdca9e5f649afe1a1a3092/memogaguliwarenukuxatide.pdfIn PDF document text
    • https://777mto.org/contents//files/towivetovapopevowufa.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/26958064635.pdfIn PDF document text
    • https://petek.biz/resimler/files/junulakosugikuxozasib.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a121849374---bamizarujuwasufabijapi.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/587b299b601a4b9cd86bdf776384d19a/xutomevopobusufirolevibul.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/31801963479.pdfIn PDF document text
    • http://gerocuki.hu/user/file/152801540.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/df4fpm17prru0jbv80bj7mv9s1/3545024563.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/ilvrf7hi23ajpos85tbolsanm2/11387587242.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/718b6ee33835c0bba7132320581b3c8d/77190355599.pdfIn PDF document text
    • http://gchs1969.com/clients/867877/File/8019889793.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+meaning+of+feudalismPDF 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_off00014c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C7B 19716 bytes
SHA-256: bbbe00f492db113c78d95140c5c921a75c33a6c3fce4e12afd09468252b7e3c9
font_01_sfnt_off00017e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E4D 10668 bytes
SHA-256: 59ddba6c0e4884def5401ea1ede3d700e23156b9655f624a5d28661bc765accf
font_02_sfnt_off0001964a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1964A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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