Malicious PDF — malware analysis report

Static analysis result for SHA-256 13d45e6244d07309…

MALICIOUS

PDF

88.1 KB Created: 2021-08-08 08:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 67c15d3134e6b214be32f922df49e5ec SHA-1: f46e21bf2d952515a909ee670cb2c84b2f9834f7 SHA-256: 13d45e6244d073097b1dd5237eb96d9512b2236f34e90ec2ce70fac977921ada
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites. No scripts were extracted, but the link farm structure is a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://willismctyeire.com/clients/c/cd/cd1fd5262213d36872a77bd42df049b7/File/43346813619.pdf In PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160be447b173e3---lakubegimexemute.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/72703d786f2a7079feef25612293987c/lolajijasoz.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/bibejenaxijo.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/53enamb1282rpdicjqgmlaka96/94379622798.pdfIn PDF document text
    • http://mckeoughfamilyreunion2021.com/clients/b/ba/baf9e6b347377fae0abe5a87436fc4cf/File/39145640609.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e37bc26ae---90836220820.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f65a6cc33---rarenovetiw.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/78056734205.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608503fe8a9c0---77313302477.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/0rgn8m702fl3npgc965pupv8e4/tazumirejasad.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/bozazageforat.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608631fb48588---94600597811.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/sinufirixi.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/42956287138.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/nijudeke.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/4mtj2h7e3ra3oqhr5n70rvaqer/xajupodogijokevolemuz.pdfIn PDF document text
    • http://mimpiindah2.com/contents//files/fuxevakubag.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4bdbe949d---siwiradesoj.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/lowokikarunexefenufol.pdfIn PDF document text
    • https://parc-hotel.info/file/lodugo.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/13208280588.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/b5b5adnea41k3e2gjkle87cbt3/62088567812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=crash+bandicoot+warped+for+pcPDF 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_off0000f34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34D 17600 bytes
SHA-256: b7cbf8901a231fed0bad5e6af7467e9cc9fb991831e87d342183ba81ddf02c29
font_01_sfnt_off000121bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BB 10928 bytes
SHA-256: a6f7335f56b7b07bc1eb084a5b551bb356dcbfe7ae6153e02aff9affce93ea02
font_02_sfnt_off00013adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1