Malicious PDF — malware analysis report

Static analysis result for SHA-256 2593fb184d4b988d…

MALICIOUS

PDF

76.9 KB Created: 2021-09-15 15:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e598cb9e210ddfa43bfcd0cef58a11d0 SHA-1: dbd7ffb5dbe9e949d12babb3bf7bc4a90499cd2b SHA-256: 2593fb184d4b988dbdc237464d330931bfb153cf4c1d4e98309e56eaa6ffa867
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 WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristics and URLs suggest a phishing lure or a redirector to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be7306851b---56914387565.pdf In PDF document text
    • http://janaturismointegrato.com/uploads/file/62685944180.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/totagawubegafubebukobim.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee8c9ed4e0---19249875410.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/54294879541.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/55155795317.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92352853338.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/72019260308.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/zutigaludilik.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131cd674bf23---99415793766.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613062696256b---82215048763.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613449a383f09---18967245074.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/17533137758.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/donojikarozerutisow.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/mugexikeromu.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/20045765901.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/18335906781.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/2671574184.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/85972999617.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/gimejusupujimadawak.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/67701854241.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/fogipowudotinapedaj.pdfIn PDF document text
    • https://mattress-leader.com/media/ronulefebomigejopitin.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021090316295073499.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/9395094397.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/17721055888.pdfIn PDF document text
    • https://kueapem.com/contents/files/49027959931.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=restore+data+from+dead+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_off0000c9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D4 16904 bytes
SHA-256: 5826b639a84881cf49170ff9a4ddff7301905c5354c143e58d2d20db0569a690
font_01_sfnt_off0000f5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A6 10668 bytes
SHA-256: 6cb3cec904f4b58683545b6b0dd9f2afbae2d6e79692b2fa6410e76f7af22851
font_02_sfnt_off00010df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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