Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2afe8be431db6e8…

MALICIOUS

PDF

71.1 KB Created: 2021-09-05 08:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 67be659d2fab02d1940f3113cd5d1de8 SHA-1: 0175dfd628b00f98f59d1513d4d31273d7e4ab90 SHA-256: b2afe8be431db6e886e4848626fb13941528af763781a8830ff10d3960126e9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised CMS uploads or disposable domains. These links likely serve as a distribution point for further malicious content or phishing attempts. Although no scripts were explicitly extracted, the nature of the URLs and the PDF format suggest potential exploitation of PDF vulnerabilities or embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://catamma.ru/uplcv?utm_term=obo+bettermann+cable+tray+pdf PDF link annotation
    • http://bjhtdszdh.com/v15/Upload/file/202151073467044.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/jolasite.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/43147237856.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/79896399618.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/funipuvadudemitarazuvos.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/dd95e6fad6d7c0476b0d12f478dea505/winixumofebixexoli.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607d168d6f6f3---12986659159.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a10e458abf4---74192579563.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e41387fcc---88924674013.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/56028472951.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/54537896641.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988c5947e83---91841947673.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c37c599fcdb---63850688970.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/tutedovotaxegobofoginileg.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/bilobilekoguwexo.pdfIn PDF document text
    • http://maihome.hu/admin1/file/86256790879.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/55546992098.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c31d33b8dad---7166241623.pdfIn PDF document text
    • http://hidramaco.com/files/files/livarubujave.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/cd82591ba65fef021250af671feae25d/61700028452.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/96050553760.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/37112671109.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/36ee2bab151f211521296a85538159f0/rafixakasap.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c80ed4dfcd---19520390446.pdfIn PDF document text
    • 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_off0000b6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ceb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB2 15640 bytes
SHA-256: b859e0b47b2813fb5a6bae97c34143683b226861d6325c6a655f14c6ca0652de
font_02_sfnt_off0000f66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66C 10800 bytes
SHA-256: a77b2c3b413476dd5b1489d734ca1ce313c31978f8f4f1f04fe89f6b6670689b

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