Malicious PDF — malware analysis report

Static analysis result for SHA-256 824fbd169ea9cb5e…

MALICIOUS

PDF

77.9 KB Created: 2021-09-07 18:35:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1dac13f7f7794d9f0d594643ce36fbe6 SHA-1: 96b2c4a63db9efe31ac801c0976eb75f18232cc8 SHA-256: 824fbd169ea9cb5ecdccd8dd2cc46ee62c33174475b0b771228c412862984716
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised websites, designed to trick users into downloading further malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with the ClamAV detection, strongly indicates a phishing or malware distribution attempt. No scripts were extracted, but the structure suggests a lure for further malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610141098c5a3---vowigefumoj.pdf In PDF document text
    • http://ligneus.hu/upload/file/99609829493.pdfIn PDF document text
    • https://fivetc.net/uploads/files/bezapitifuwime.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16119fdb1e4933---38113588879.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb7694f575---99248794085.pdfIn PDF document text
    • https://tmtteks.com/files/45604959607.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/jetapavewuvogixa.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/kazeferakugovejot.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/37475731056.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/wodigig.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607231267c8f8---febupagubuvugusab.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/15546432680.pdfIn PDF document text
    • http://bruisedreedfoundation.org/clients/4/4d/4d9d7eec3bf3a09fa0457ace138f6a4e/File/sarenibepujisufanuj.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a75f6a7f2---savorimegu.pdfIn PDF document text
    • http://learningkey.org/userfiles/33014683545.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160767bfae1f0c---wulevewonoxefosupuk.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/kipetokebuk.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/vumijeguvupefusimudipa.pdfIn PDF document text
    • http://sakra.sk/storage/file/69889865492.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/6891624581.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/8098113867.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/posemo.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/42599926544.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/vovijawojusowa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=a+model+of+creativity+and+innovation+in+organizations+pdfPDF 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_off0000cb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4B 11184 bytes
SHA-256: 865a5237349276a99064a1388833754b5cbcd7a4082e72bebd972ad33c306106
font_01_sfnt_off0000e54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54D 17208 bytes
SHA-256: 3f144b39522b5ad241176d7c7c073ec1bf6dd0f051ec9de8e55bfa199cb853e9
font_02_sfnt_off000111ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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