Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e7bbd3a774a5904…

MALICIOUS

PDF

82.4 KB Created: 2021-10-13 18:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d956f38ef4860dc1d7b61b0d9defd1ae SHA-1: 81231dc1b968cd32f382c25171d27f53a10a3e22 SHA-256: 1e7bbd3a774a5904e8b28b737f3031374a6924e4002cb2a322295655e5670549
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, 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 embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f52da61b85---webamadebo.pdf In PDF document text
    • http://teusz.pl/UserFiles/file/wupaxetuzetifim.pdfIn PDF document text
    • https://businesslife.com/content/files/868138363.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/fujote.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/kuximabojetesivepukeji.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/81624802164.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/13192812228.pdfIn PDF document text
    • https://reha.bg/content/upload/file/tojaxavevolidovuzigalutef.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/kalefipora.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/sanof.pdfIn PDF document text
    • http://myslizdrave.com/soubory/6997232948.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616594a8e5050---13402844240.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/75683817829.pdfIn PDF document text
    • https://lyna-garage.lynacarrental.com/htdocs/cljr/data/files/78256840182.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/39552723237.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/10984056459.pdfIn PDF document text
    • https://vgk.tw/upfile/files/2021/09/29/pigebeminaxidebewul.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614766e336bd5---buzogipenuzin.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/kisanogowuk.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/4272b8146719a04c58730e19bd5f717d/jumojapog.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021911107499280.pdfIn PDF document text
    • https://kaunas.cvzona.lt/resources/img/files/14598418103.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/2750345973.pdfIn PDF document text
    • https://westech.solar-napkollektor.hu/js/ckfinder/userfiles/files/xabege.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/896FEnmJZlk/uplcv?utm_term=thar+automatic+on+road+pricePDF 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_off0000da8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A2 10628 bytes
SHA-256: 21448c743cc30f86ca72e75905e13de7119184cfe200e35c32a54a4800c83346
font_02_sfnt_off00010ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC0 18900 bytes
SHA-256: 08ca00bbc1faba8e8e9b332f1fb0ad3dd62f64e84c7740f18b771451bad5ac68

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