Malicious PDF — malware analysis report

Static analysis result for SHA-256 57d3c90aeb72b08e…

MALICIOUS

PDF

128.7 KB Created: 2021-07-03 04:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: d30000bdfccf2985dea0facf2c1639d6 SHA-1: 174066096b3b36ef0e6f2b73169f3cbf87a97abb SHA-256: 57d3c90aeb72b08e249c143ed8f326c7ddb040d857d5d2be397183aed913aa9f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, with numerous embedded URLs pointing to compromised websites that likely host further malicious content. The heuristic firings confirm the presence of multiple external URIs and a link farm structure on disposable hosting, supporting the phishing and malicious download attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

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.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160797223ebd6e---nobiviwibawiz.pdf In PDF document text
    • http://antifftech.com/uploadfile/file///2021050912434899.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ldcj33rbp1squ7mt9c7j6u93i/3229622788.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/a37c50c2e2faad52153ac96144b03af7/20944029998.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/f716932f148d8792a8ce29bae890829a/54641142917.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/4985329197.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/xiwekoxebuvumakofesida.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/8r1tokcsall5vhi6mlaqj85qs3/kakozabinofofujuzojobe.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/31302772278.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8513000e4a---50673489259.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/bcad54d3c5667cc6886f390ef2f3bb6a/24885189596.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607207c57e061---1987517091.pdfIn PDF document text
    • https://welltowork.org/wp-content/plugins/super-forms/uploads/php/files/a1e3ef45cdde45a9089b9f172f66986f/60861976343.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/32364a90a3bf121bd1030f5c27a72dbd/jipebupek.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/8fe04f5cfa37ddc2787bbcaf1489f1ee/lukexobafofe.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/s4sancsotrvg3pjb1fa98vttp9/zufoxazuxuji.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/ea977055bc2ad240a953591d7fd50daa/59964930413.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/4126485300.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/8711cdf6951sqocaonou30fo82/7544786326.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d24ca8d08---wuzigofatilejuwezuxejipir.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/zetevefajixiwazurus.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16075e7710f97e---nilorefijajobobo.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16071d36b82354---12729722798.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=tcp+ip+questions+and+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18165 17204 bytes
SHA-256: 9212acf6627de82f6288ad3c389f0584f26971d08a393524ece7dc2ee13324a2
font_01_sfnt_off0001ae65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE65 16116 bytes
SHA-256: 74ea40c6abafff908ba0a862ebf25ee1d47d31f530ca964bdc695191fb21b084
font_02_sfnt_off0001c3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C3BE 10756 bytes
SHA-256: 5c537f68993705513f99fee3aea264b665b296d0077e4f0c07e8781b89d6f105
font_03_sfnt_off0001dc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DC80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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