Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c83db8ffe7daa7…

MALICIOUS

PDF

86.4 KB Created: 2021-09-16 03:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4776bfe6b7ee53ba25406f5c0d28bdc3 SHA-1: f4d792e2e72c00f05cb7b1db4f4b0dc2f2622447 SHA-256: 89c83db8ffe7daa7a2517a65154b32e3a13b965f3728f747d76bb2c02740b714
256 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including ML classification and ClamAV detection. Notably, it employs social engineering tactics like 'ClickFix' and 'Clipboard command lure', instructing the user to execute commands, which is a common method for downloading and running secondary payloads. The presence of embedded URLs, some pointing to potentially compromised CMS uploads, further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 9

  • 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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://bozoklar.org/ckfinder/userfiles/files/tavegazerug.pdf In PDF document text
    • http://alfavs.eu/userfiles/file/14325068715.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/jutejokup.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/44584782678.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/kagobasegojofuxuguroturub.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/34818925081.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/95244241550.pdfPDF link annotation
    • http://ipublicity.cz/data/file/bavogipufimu.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/megoputabinefewiw.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/9mrrp7oh21mel00f77lr1uenq4/rulinale.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/sasipovujanimaxube.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/xopalap.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/58250306081.pdfIn PDF document text
    • http://termocity.by/pics/files/wipojor.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/78430717453.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/mewododefurigiridolona.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/girulororawopusirun.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16142702290f8c---9246879925.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/f6c99f37c67b8eebb3032f502a22552b/69658606584.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/27238225413.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/40783658300.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/93941163137.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/midipite.pdfIn PDF document text
    • http://mopron.ru/upload/files/monixilabeletapakamewetim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=fire+7+show+mode+hackPDF link annotation
    • 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_off0000ee75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE75 17712 bytes
SHA-256: fec2c1452256e232910f81dec2fe805ff85adc2a30df0652abbfd9d27a68031a
font_01_sfnt_off00011c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13498 10592 bytes
SHA-256: 6697fce5c3e255ba317aa0ae7675ff22d6643565987b27977c1b7a3c78c64442

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