Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1bdfcfcbf520fff…

MALICIOUS

PDF

81.6 KB Created: 2021-09-19 09:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f106addcd2fda075c2ac8bc1459cb8f9 SHA-1: 649ede3167cbd50a400c3a9b2c08b233ef7d2fc8 SHA-256: c1bdfcfcbf520fff5d047f330134cbeade47621af88a9c1328734319cb7331b2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were extracted, the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://ehotelgateway.com/bot/ckfinder/uf/files/nidat.pdf In PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/16422676631.pdfIn PDF document text
    • http://a-pluset.com/userfiles/podaniraverixobuw.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/fimewumimafulojivep.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613605a4143e3---vemugezodeke.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/boxemudabijos.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/nuvapimovurexaxukegita.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/59237579420.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614227dca2e25---37618608915.pdfIn PDF document text
    • http://inphilong.com/upload/files/77293136731.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/xuzidonorabugeriwogipaxez.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/neduzexubepuvimun.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/2469653169.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143960d80270---tafezodidul.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/96125382114.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/82014268451.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/50984553956.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/13083834503.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c991c3737---56269530541.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/61088006799.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fce557b0af---gasisudiwawo.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/62994020587.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/86831729690.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/wobatuzurejinunir.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b16b205236---16347619687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=where+is+my+home+button+on+my+android+phonePDF 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_off0000d76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76D 18548 bytes
SHA-256: 4f0fcea62d523a6b22db09531d733b0acb1e2149ca96a1eacb08cb18799bacd7
font_01_sfnt_off0001073f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073F 10960 bytes
SHA-256: b96eedd05f88686ba747306abd8c98470cb5135b877872ab0200c00ecf69744d
font_02_sfnt_off00012053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12053 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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