Malicious PDF — malware analysis report

Static analysis result for SHA-256 f017e3796002fed7…

MALICIOUS

PDF

79.2 KB Created: 2021-09-10 08:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b8fcf834b563b1e0ba5b229d27fd0d80 SHA-1: 909933d0ed0e8d1f4b8106a093672ef9e5c7ab0c SHA-256: f017e3796002fed7eb91765b880016819596e6a9bcb585b97c2b6bd9e271953b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and link farms, many pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the final destination and potentially track user engagement with malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=minecraft+car+mod+android PDF link annotation
    • http://cristal-in.fr/userfiles/file/36745202545.pdfIn PDF document text
    • http://licausi.it/userfiles/files/19667351854.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322f91d2dae---42081381009.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/9164523780.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad2ddcb92a---dolikarawuxata.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/57359684222.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/38578607725.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/4748359086.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/70486456259.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/96051318136.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/zutuvugejubavesaxabi.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137d38224c88---wudezesomep.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/tixafuzax.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/73165128097.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/29130608421.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326461cbedf---16320722896.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/64389071899.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/916a0e32fe717819663538a692edf029/kedufakipozodu.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/15699404369.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134e7e23d289---xowawowibeg.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/mabozawizexa.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131258f5a538---viwoxe.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/52279809064.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/53589817967.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613950b540b7e---70592864455.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_off0000cff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF2 10416 bytes
SHA-256: 21db6f8de8ddf75767ecc3336cb155a2f48647b18b5054b5281800e009350dd5
font_01_sfnt_off0000e782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE782 18236 bytes
SHA-256: 8dcb2740049c9b0cecc16944d9ae66e77b1cb073222d622fc41846ac3ce75e33
font_02_sfnt_off000116e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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