Malicious PDF — malware analysis report

Static analysis result for SHA-256 d167cbda48ea83b8…

MALICIOUS

PDF

84.4 KB Created: 2021-06-28 21:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b1457382cbd87c1d7c151b8a643058f8 SHA-1: b3b9be89c46b6d252d893cddd25bde956a2902e7 SHA-256: d167cbda48ea83b88b39572a5272b1aa5f7be33c9e863920d2700a5913bfad0b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to distribute malicious content. The 'SE_CLICKFIX' heuristic suggests social engineering tactics to trick users into executing commands. ClamAV detection and ML classification confirm the malicious nature of the file, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/7948997b019ae234ab6a5b67a813eded/49274315457.pdf
    • http://seamcc.com/UserFiles/files/40746421172.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/8b4a4f3a88a7bc1f19437c4a89cfc4d8/11425846812.pdf
    • http://zgkimsteszew.pl/img/upload/files/5931204696.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/tv5cqvgv9av0vinbn0nohvr7of/1079685526.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c81f93b2d3---wimejawazazesizetimi.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609da453de332---84731140930.pdf
    • http://cuatro-pr.org/sites/default/files/file/juxisikodomodug.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/fc03d7a86f0133885590d900391bb86f/13552559935.pdf
    • https://mallncart.com/userfiles/files/71718474932.pdf
    • http://urgentcarepb.net/userfiles/file/89901853602.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8550a9839---16906682577.pdf
    • http://airholic.com/UpFiles/WebEditorFiles/file/degafarepuxap.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accf95f1df0---ranuvezezebevolu.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609129ea67553---40554657848.pdf
    • https://magatek.com/documents/file/6657270966.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609166adf335d---77944949047.pdf
    • http://jinistudy.com/_UploadFile/Images/file/kupulelukamonukimusox.pdf
    • http://parkhigh65.com/clients/4970/File/58518018003.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac36b35679---3889412062.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/f9tjsipgec6leg6dhldcjtn4t3/tamof.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=disenchanting+table+minecraft
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfba.bin
a013ce2342554bbd70a9f85285a6053b67e9b25eaba0dd22223cc179b1b1ea16
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBA 16064 bytes
font_01_sfnt_off0000e4ca.bin
38f3135e95005701e35f6cb8cc262eb03f8ecddece77e395b2430d69d5cd7b1b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CA 17352 bytes
font_02_sfnt_off00011189.bin
25748b99af58fdc4df851b7e31a8d83ee12137125377e32f69ae46b26c2e4c97
pdf-font-stream PDF embedded font (sfnt) at offset 0x11189 10804 bytes
font_03_sfnt_off00012a3b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3B 16792 bytes