Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d9cf0b21ed95bd…

MALICIOUS

PDF

91.4 KB Created: 2021-07-05 17:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1b641e00614e9a93212e2d71b78f20e9 SHA-1: 6417bdfe79944b0ddb85e7311a9b2edf68bd393b SHA-256: 05d9cf0b21ed95bd03e57b07f2db51691f2e7bd2858c49fa671840fc7b15dac4
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common method for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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 http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/lirimefiwaniritigaxewusi.pdf In PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcae482555---67960331741.pdfIn PDF document text
    • https://kompaspt2.com/contents//files/95470825211.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/24410438856.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/2c203cc8f1d9a4cb2ce75f2c85cad24d/doxuzazudam.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/kaveremobav.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/52825963503.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-7-4/20210704031612379520.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/94418700794.pdfIn PDF document text
    • http://poorclarescork.ie/images/tufiremujedobugugesuf.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/gefekos.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/8910c1f8509a5cc99f0411e7e22242b6/vaxikiliziwememozofeso.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/372495eab7267ee35882e90449950989/xepilovanigewozobovezukuf.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/tevamogapad.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b8df54fb5---76328824828.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/tegubipikika.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079d2114cb15---pakeximozuvivapiri.pdfIn PDF document text
    • http://reikihaus.com/clients/75291/File/jogufe.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160cdcb71035a5---karedudi.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d45dfa99d4---fazefo.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/tuxifomibedadivakelip.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/41807847017.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/75136325822.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16093f2df46ad8---79292177893.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3121d21a70---48506482632.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc65f3dbc39---lojenifivepozemewiz.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e88a852718---47826658259.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/62912e4c9cf60e087d295c36d435a751/66956654932.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=quotation+of+jose+rizalPDF 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_off00010137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10137 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001194e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194E 10556 bytes
SHA-256: 55cee72dbcd9ec2669d06a9f7794ce28dce6e36b086ab33640c092acddc31910
font_02_sfnt_off00013197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13197 17236 bytes
SHA-256: df59efc1abbdbeb6386ec084bb6bceef9117bc50d70b1ea6dcc75d5f9f136db2

Open this report in the interactive analyzer, or submit your own file for analysis.