Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceafc275488e26f3…

MALICIOUS

PDF

80.7 KB Created: 2021-09-12 12:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 104b4b31c0fe81a3e908baf05dd44178 SHA-1: 3b49a76ed29e83058d3208dc0a79354941287bbf SHA-256: ceafc275488e26f3d9258ebf67635b0532ddad94e8bb0735f008ff7eaf8f672a
156 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests the primary purpose is to lead users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://philabc.ru/uplcv?utm_term=system+folder+in+android PDF link annotation
    • http://ohappy.org/userData/board/file/19978189689.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/80900491657.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/jivetapufijezerupakenew.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/r4k4dsq14hop8t70rrf42fh4f7/pivufinuposaduz.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137cef162c72---40188243832.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210905032018.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/wasagiwitajepadisibosuwe.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161345b5d41f78---renifalegop.pdfIn PDF document text
    • http://yuli-china.ru/d/files/19890940833.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/71470449670.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/tozirepuse.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/pomakexozosu.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/nudebowuletukizubevo.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133e30c47748---81048047095.pdfIn PDF document text
    • https://panama4d.com/contents/files/58777017902.pdfIn PDF document text
    • http://foxadv.net/file/muzatodofudijagopusaf.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/vakir.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/18115718667.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/saliletipinitavob.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/95763231323.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/35293316302.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/28991444243.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_off0000d645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD645 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5C 10704 bytes
SHA-256: 5239eaf3bcc48fdae52e8cd5b297ad53a3b070496ab54d0a4466c38bfc346f6b
font_02_sfnt_off000106de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DE 18092 bytes
SHA-256: 0e84401424d9786d40d699536522e996d9df2e7b5c8e2376c366e62e9d4890f6