Malicious PDF — malware analysis report

Static analysis result for SHA-256 b332c3b87f0819b3…

MALICIOUS

PDF

97.7 KB Created: 2021-09-06 20:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cc8a6f25b1e99aa758b67d1518206762 SHA-1: 4a4630f2ba5ab49c779b43d9fb6a0dadf26a9448 SHA-256: b332c3b87f0819b376f0d53cc34bafb86c88eb575690843aa932e665f11c08d1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the overall structure and URL findings point to a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bandbaajabarat.com/ci/userfiles/files/xedakonukavelotuloboki.pdf In PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/24582825007.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/13575351257.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c25ea5ab900---20097582569.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607445f55f233---2377605219.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210822741_165541388.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16092d2656f529---93726375464.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/p450kehhe6vfhcfaojc59mtcp2/pinotunapugevotevigi.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/bekebinumukitevuzike.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/f73472f22d0002d4519ff0bfcfb436b9/41294536742.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/dowusonubuse.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d04303856---veralijisax.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/xoxudiwojuzaxok.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/4ng4e4rp4b7lajlsb0kq4sg8k5/suleniwonebesizakuwot.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/88411975736.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607a64c75c372---58649769137.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/68797232879.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210814_222727.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100e2d8693af---96900154488.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/88288684637.pdfIn PDF document text
    • https://maria-galland.ru/files/file/fisasipilakotivemigiva.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/72963983570.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/nenaganokiwo.pdfIn PDF document text
    • http://billsky.ee/files/file/75004238753.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=nise+da+silveira+livros+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_off00011500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11500 10332 bytes
SHA-256: cc06d9fc899c8f9ffb4d6932bb999714e4a97e6da2fb79c2f664afa0c840b990
font_01_sfnt_off00012c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6C 20308 bytes
SHA-256: 082fc0bb2549f837f39124f46142d388e76b9686f4df1c8cd9d06afba3e5b502
font_02_sfnt_off00016132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16132 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1