Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9db47955348e31d…

MALICIOUS

PDF

106.0 KB Created: 2021-06-28 02:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 302d173d080598ff5cc6365114dfd2ed SHA-1: 85a74c47f7624f1769a4a0eb411064fc3671f0c4 SHA-256: b9db47955348e31d01745585502b1f6543424e2d934c4a71cad352b31ef50f4c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple unknown URLs, many hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of numerous links and the nature of the hosting indicate a deliberate effort to obscure the final destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/623c8b210ef49f825f11ba6e3c7cb9fb/rujafakuxaraxegavu.pdf In PDF document text
    • https://cuisinescartier.ca/upload/editor/file/wufowo.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d346474066---80919512776.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/kafebutuxomenebejilelo.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/suvalipejitebalokarezox.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/d113cbbc071c2cfa3b9245e15327b017/44031685453.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/0322dj1oi6qcpr9pergrtf3th0/37200228737.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/44564595752.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d23678134---32471834968.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/zulemiwo.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eed979a8a0---7075150114.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/dc339a62ecce761a7e2afe1351b0a61a/8299776248.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad811e68e9---devozeluvejumuzumever.pdfIn PDF document text
    • http://humanlitech.com/files/files/vugiz.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e15da4384---zikav.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fb20ed227---milejoga.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/nigigejurasolu.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606efdc1cffdf---gokuliranubiwamuze.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc4ae9d0d3---22509760787.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/fulewexagu.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/modaf.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/eclnam1dtu48kc98dq57psg3u2/14854254703.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f252b9c281---52509387418.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/eb951cbd1c048cbd6206026045866f21/vaxiwanegumexulepetigu.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160792f79d434d---kokolutusaparorekobuvepe.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a62b3f68ff0---71025767572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=cold+calling+strategiesPDF 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_off00013c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15452 17340 bytes
SHA-256: 7c6ad3d61e487f8cb137ac5ddcdc33a5499a5e151a9bfff7870303e0fb6a73f9
font_02_sfnt_off00018118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18118 10576 bytes
SHA-256: 6d339ba53a233e547f1abdc2d150b63c60711d6765382cbe7bd610c6585bef38

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