Malicious PDF — malware analysis report

Static analysis result for SHA-256 499d53dbdc864481…

MALICIOUS

PDF

103.9 KB Created: 2021-09-04 15:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: da4e67f3601ec7f3e4e3eb890f59f4e4 SHA-1: 7eeffd4d058961880e7e22991a757ee21eccf75e SHA-256: 499d53dbdc864481155ead16ee58d840d4f05b09686ad2775cf8909f3dc20d91
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress sites and other potentially malicious URLs. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/9b3f2896086ed0df266036051b09da6d/39909678859.pdf In PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098699085479---54869851912.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/mojukafa.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/85279530643.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/56013988965.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d4b68d2b2---lisugilubevazisod.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/lanivura.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/tdaf2avtqttkq568efgu7hd4me/betolekuzexepujikefoz.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b579eac4293---rudutoti.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160872ab09f8d3---digovomevokopaxa.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/ce5ce019636182a0b910db8902d11f43/79198782512.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/fisojivox.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/a1b86e3909ba5f9c6354e3f959f654cf/36837502583.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/83789785852.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b1b07742d---kefipi.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/dusogutez.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077447e1e7aa---muwegi.pdfIn PDF document text
    • http://handgun.ee/media/file/zezokarigapexo.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/filusiludalapuvotetu.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/xinadad.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/52253630241.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/tegogu.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/kebazugigadifufad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=manual+de+ujier+cristianoPDF 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_off000126fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F11 10588 bytes
SHA-256: 7432bf9bcfc50d570bffa1e640a397c32c687ea728484e4b58537038d8d9221d
font_02_sfnt_off0001574a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1574A 22576 bytes
SHA-256: 3f353f08ea3dde9f8881a444bb4a9a3a0b08dea07ccede9fe94195718b69e90a

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