Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1c0531f663a75f6…

MALICIOUS

PDF

97.1 KB Created: 2021-09-15 09:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bb103fb5d4e80da9cf4ca276582fdf86 SHA-1: 267583cf12b7ae63edbf7b738f06029c055e9593 SHA-256: d1c0531f663a75f68a9b8277f27a3f2f4facd7dc222ab9a2626b8634bb77c3f0
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised WordPress sites, suggesting an attempt to download and execute a secondary payload. The heuristic 'SE_SECURITY_BYPASS' indicates the document may instruct the user to disable antivirus, further supporting a malicious intent. ClamAV detection confirms this file is malicious, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://alajuusa.ee/media/contents/file/19645143061.pdf In PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/35519837320.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210903_133656.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/07/watowidedejowavosedakalu.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/zovegenivojizulomulofajo.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613566468333e---subinelokejami.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/nowizojedagabekim.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/fujizepofi.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/46764698969e6519bfd184cc5fc861ee/safesus.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/debilabozotefila.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/wasonamederagikimo.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/wonoburujepugisexa.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/zuwupevuzugug.pdfIn PDF document text
    • https://bursac.net/userfiles/file/natogimeziseseli.pdfIn PDF document text
    • http://hanyuchina.com/upload/files/jegixunizulogubogujufike.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/duxekijugajazawik.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/folusifixij.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/xigedo.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/61339516507.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210910211835_vmjmip.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/lubivodat.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4eda927e1---jojepema.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/38008866891.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/ef5628c93ca6c789f4ad36604c71d688/mebevalesofuda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=descargar+besiege+para+androidPDF 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_off000111fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FE 20044 bytes
SHA-256: a39c3e29a2366a235258a22a4d4336ff4054b0cf840fa98a00cc90ce4f474ea4
font_01_sfnt_off0001467e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1467E 10684 bytes
SHA-256: 799e2dd3a369cdfa96b49606ad201b88bec263eb17146321d576183f45cd9d0b
font_02_sfnt_off00015eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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