Malicious PDF — malware analysis report

Static analysis result for SHA-256 5117b2eb07b3b0dc…

MALICIOUS

PDF

74.8 KB Created: 2021-09-03 18:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9839a449458de27e381961e7de7d6b0a SHA-1: e484f286c9b42e0738ab6b92b48e93f991df10af SHA-256: 5117b2eb07b3b0dccf185b09270dd9b37c730bf2726869ecc50548e086903645
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to potentially compromised websites or disposable domains. The presence of a 'download button' heuristic further suggests a lure to trick users into clicking these links, which could lead to phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://goref.ru/files/file/66616302513.pdf In PDF document text
    • http://vuonlan.vn/data/upload/files/13545122580.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/kotojamamumoxotufefetafof.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/nopakusodorex.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/7816053824.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/gixevilitivamutut.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/fa75bd191a3fdc606e05902fdc697ac9/zaxebegibifezowukafed.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/pekifutuna.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/54238bd8da1bf6a9c8d627f59329d6d4/24590430420.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/xesadadelixunir.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/mazimoza.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/87055030058.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/c340ced1dd388ccc0027e6d8b0788c22/23064955516.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/dewapulurarafir.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/ferefuxabodotudipoma.pdfIn PDF document text
    • http://w-mill.jp/images/file/76750376989.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/161005e70ec1df---rupawog.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce520a2cbd---31110674536.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160b65e643efb2---61273242805.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/61727151337.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161031460d44d6---6444048755.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/59007926575.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/gabavotutugutenevudij.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/dufapajozuzerumenozugukib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=enzymes+worksheet+ks4PDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC13C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD953 10488 bytes
SHA-256: ba5dc2ec416efe8f76aff474a2ffa7ba7d67f86f179d8464f310d69e5d0d37d5
font_02_sfnt_off0000f11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11E 17188 bytes
SHA-256: 0f65b829811037efbff48524379cbc2807cc3c23272426bf9445e8a3d1bb0aed

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