Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb304183b228c695…

MALICIOUS

PDF

75.9 KB Created: 2021-07-25 02:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 77ad46dc41fb849b5ac99f507f24a7c5 SHA-1: 164618f2c61a0da3e531ad04f957e0697701c220 SHA-256: bb304183b228c69554ba07237ee6b3b0ee2938c4161d8ece3e520eb4826c0b5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms hosted on compromised CMS uploads and disposable domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted, but the structure points to a phishing lure.

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 https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/xowunuxawefumalizakad.pdf In PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/022eca0099027c3aca02eecf8a75bbea/48264657921.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86a0b77594---22580803419.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/sulokugufatuveliseguz.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/6dc90983854c8708ddd46a7d84f832f0/46835833385.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7ae98fa62fb6a318526bd349025475c7/josugunodokodofamenex.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/panirokizizineliwezujogi.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/30517928333.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a975e5cf6d1---jaremogutikiku.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a573b88294c---74090878438.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9503a50d5---lepujifususogevaxiwulov.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/jirowozeziz.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/vevorut.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210713040436188.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/2f26cd2049a2a252f8a43044c52eed93/61670300854.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9997b3030---zirosilazugopasapovile.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b715e2a08---73034878743.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607a650800658---95864661083.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/6b15a8a268de50980e3d5149730a42dc/72774592167.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4558b41a9d---fuvuk.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/33791203022.pdfIn PDF document text
    • https://flyags.com/editorResources/file///2492137727.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c76c984bb46---turafokelegavupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=bose+soundlink+mini+update+windows+10PDF 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_off0000c4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F5 16648 bytes
SHA-256: 097b4231c49072fba0785a2c5e6d34c5bdced41248f9613ef248a9cd362dc4fa
font_01_sfnt_off0000f081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF081 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10898 10956 bytes
SHA-256: 151469a7435619eda30809e0efef7ff90ee064e443845abbe9086ac14ad8b8a9

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