Malicious PDF — malware analysis report

Static analysis result for SHA-256 07613c901d417384…

MALICIOUS

PDF

88.6 KB Created: 2021-09-20 19:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b7a47fde15ddd5a393721b34aec1bedc SHA-1: ac42463cc5be49312051bcc19911e4d5938841da SHA-256: 07613c901d41738471a67a261ab464c926c99c188b6e1c32a18e4ea393f7e551
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF_JS heuristic and ML_NYX_PDF_MALICIOUS flag indicate the presence and malicious nature of this script. The script likely redirects the user to one of the numerous external URLs found in the document, many of which are hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://adian.eus/files/galeria/files/51565567339.pdf In PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/vrackboduqleqhckrogab5vgp3/53953764449.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16145e69503a4b---99009265126.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/2123203169.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/veledepususadaviputan.pdfIn PDF document text
    • https://cosmopolitanhotelbg.lastrada.bg/uploads/wysiwyg/files/dozifebada.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/f4d86e1335ea18e1f41b5a85f28575f8/8643151598.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/vuten.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/fazix.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/bnnkvvs2ugkl8cc6mue8nu0cp6/nawiweziwisawejajuguvi.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/basolofetewamonipofekub.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/suxamasuwodibotuxodo.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/0f5ae248e9bf4a7e617bf8d0d91bf276/22482742455.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/falokezixefajidupaxamep.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/c56901dd7b0a421d712a377e9b2e820a/jofojonul.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/kesumeramupazafemuxob.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/neriwabudexakurobavud.pdfIn PDF document text
    • https://rm-parketi.si/uploads/papoxomejiruta.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/66545898073.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/63412900931.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/50757599175.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/memubiwozelutegobudovez.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/73089589778.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210908155347479.pdfIn PDF document text
    • http://goldmustang.com/files/files/tegijapito.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/85072373718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=which+country+has+the+2nd+largest+population+in+the+worldPDF 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_off0000f33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B54 11204 bytes
SHA-256: 5cf28dfb2b99963bd7366f847603ff1efca566207e58b7991377a211eee620c6
font_02_sfnt_off00012570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12570 18048 bytes
SHA-256: 56c79569a102ec7d91c58216764bc410398d394d5551ae55fb7b8f8b6668147f

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