Malicious PDF — malware analysis report

Static analysis result for SHA-256 b87c03b04a57ddc4…

MALICIOUS

PDF

87.8 KB Created: 2021-08-04 17:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 610f9208c4b919c3735ffa22aea15038 SHA-1: b0bfb43b27487b590d152fedb37251e0f301ca4e SHA-256: b87c03b04a57ddc43f594969f33f5e0c6fb837b0cc0eb3497e3e2e8dad76f176
252 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains embedded JavaScript and multiple links to compromised WordPress sites, suggesting it's designed to lure users into downloading a malicious file. The 'ClickFix' and 'Clipboard command execution lure' heuristics indicate a social engineering tactic to trick users into running commands, likely to download and execute a second-stage payload from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c844b82f3---86432418195.pdf
    • https://ringid.vn/ckfinder/userfiles/files/seredenojitozupog.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887e52d063a---kenevibaboxetexumabipig.pdf
    • http://aodaibooking.com/FileData/ckfinder/files/20210620_8E4C027D010CD235.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/cdacf992dc6c78a7046f29f5b6a5e09b/gaxegeredogidoxe.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/5222bd89d3c84c75a1bade540a08efa3/53453929036.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/f4908445ebce5660bf23fbc722b1476d/25057498419.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a09d8193586---75366128051.pdf
    • http://emilygrilltogo.com/uploads/files/91842919484.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5bbe09d8d---kitisuvese.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608771026167f---mamulu.pdf
    • https://sibois.eu/userfiles/file/46830928390.pdf
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/xunujorojevuvikenomasu.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/123922fa45b336c20b735f7fca15ff46/87317283434.pdf
    • http://brandnewgoods.net/userfiles/file/judofekexipe.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c17334249db---41626148413.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160836e1d2e0bc---49272106332.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/1af3285962a99d3b85cd0e4e48d69e56/59583128244.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc2fc74bf4---8657936822.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607178524d7da---lixiwemezijelawufunexeg.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/rtmvkh11lbmb0dsur4hi54qf8b/73262834651.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082b3dde4906---rupodililutilozidile.pdf
    • http://seanmore.com/userData/board/file/47761119960.pdf
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/lofileju.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/19ca70f4e4377ff7be7ae84a0022b841/fexagi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=this+might+be+caused+by+missing+microsoft+visual+c%2B%2B+2013+%28x64%29+runtime+dlls
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeb7.bin
f31ddbb9deef2b1455791f22e101d43a676f7a2364f5373221286616b6b21301
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB7 17072 bytes
font_01_sfnt_off00011b44.bin
d7d1ef90c35571287098272487f1397fd7d10923553acaaa60f14c907803a58c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B44 12276 bytes
font_02_sfnt_off000138f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x138F4 16792 bytes