Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b824706c411a36…

MALICIOUS

PDF

102.2 KB Created: 2021-07-01 12:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 63dacda0889b6860104b4ce6e2bf538e SHA-1: 5b31a3eb16ec0b50e44eab4780ba110b46538bf9 SHA-256: 71b824706c411a3654a606be00bb5676fd6d9df706bf0d74bd8e3463b477b8f7
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs suggest an attempt to obscure the final destination and potentially track user engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://www.hydro-tg.pro/upload/file/78909247540.pdf In PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/4119571434.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f334514d8b---82474771273.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/1f05cd41d5d8faaece43ce05b51e2244/jateberamix.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084dd70f3766---63624272976.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/14795403327.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070dde71aa0f---lozuwivokemogivomenapemo.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/89o5a1o3isdfkjdj7tqodsa11h/xewajogesef.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7ec51aa0e---77362875181.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/xarogafi.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6c45acb13---92305067682.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/49306116703.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/96c0c799e6cf27906a45d97c5979a82e/bajibo.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/gosezuge.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d9ae5872d---77676811151.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/fazamaxenulog.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/julikokodemixidexefa.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/915fem7rsfl3bovgqoujf7vfn1/41890667494.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/7cbtkjru29te3etc7tu6dp138n/bivowox.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751ae4ba1d7---vufezazekubirek.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/49597286327.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/15559823237.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=sale+consultant+interview+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2C 17400 bytes
SHA-256: 5e6b25e855d10025c7041512550c0b8a6b51d8b3e478e40e6825de5b7985cecd
font_01_sfnt_off00015a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A53 10836 bytes
SHA-256: 3ab8d9ce75d8fcbe7db0dc2582ecfc902755ecdaff212bb1c1039c90d7d3d4fc
font_02_sfnt_off0001734b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1734B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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