Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a2e62cfe582dca5…

MALICIOUS

PDF

81.4 KB Created: 2021-08-21 00:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3a1152bf025f73b0ce3209040d5da0e9 SHA-1: 81a425811bde7dff79a858d5bd4545514f79218e SHA-256: 5a2e62cfe582dca5ecc9bb2fa5ae2ab1b3eecc64f4ce968dc365f2962026149b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of external links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://vivaldiskibus.com/FileData/ckfinder/files/20210621_2D6EA81814308E8B.pdf In PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/4sgclaimeqh6hiu6hvhp72pq8l/10910957853.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/22f7e0f31a77929cc6d971afb3448cef/tekelopilutirakajemamu.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743357a5a30---67820337610.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/nuxozopubafakiker.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/71471c5ec042e92859a9af0213644a7b/zazezidif.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/82749511232.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/pumuxe.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/h4k4nn7oflu30vpkir22m6r3u6/1535392791.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/89744255945.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/powojibolaf.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cb05cbadba2---3263879943.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160eca0432cf6f---59426212097.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/20159723643.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/pcqj2d88hr0ljeb8lfdp316eqf/xukivikefitawe.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/56909836523.pdfIn PDF document text
    • https://bkht.vn/userfiles/file/pusonisulowek.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b93c4ec1b19---jonuteje.pdfIn PDF document text
    • https://wasael.com/userfiles/file/fidixutinarazi.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/0icc337erl71hcp1fh4khk9l6k/lukukuxekovuzura.pdfIn PDF document text
    • https://bak.vn/upload/files/92527170416.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/91092376108.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/5dee13ce704548b2f04b74b83d9e631b/kanipeguwu.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/32127474374.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/tomena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=fairy+tail+english+dub+telegramPDF 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_off0000d45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC72 10908 bytes
SHA-256: 6bca9f35e73dbb39ca45fd77b524c9fed5cd9c12657fea754c625de5a7149aab
font_02_sfnt_off00010538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10538 18576 bytes
SHA-256: fdd6df3ab2811568f800b3a5bcc64e0acf673d96590de73ece3136a11298ffd1

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