Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf2a32bbc8bab56…

MALICIOUS

PDF

86.9 KB Created: 2021-07-05 12:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 20d89ca87d3b250eea383aaf5d4f2ef1 SHA-1: 9c5b33dac1c5b38778f92659e68a0441ac42ff3a SHA-256: 6cf2a32bbc8bab56ec5bdef4f4b4920e66473cfdb4d8a8a8289492aa3933360c
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous URLs, including those with UTM parameters, suggests an attempt to lure users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://drafthe.ru/uplcv?utm_term=i+always+have+to+steal+my+kisses+from+you PDF link annotation
    • https://securitydm.rs/slicice/file/60680727024.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/f9e868901b06863b0eaf7b29cb09a915/35604805515.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e2dd5c13c---57941822803.pdfIn PDF document text
    • http://slsnn.ru/content/file/luguxosamifigibijukamuxid.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/wodobidazowobabimuzotik.pdfIn PDF document text
    • http://lblussana.it/images/file/wopefaribarikixatesip.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/sumaxisudagevinut.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/99cef997fe7b3bfe12625e9361f54d0f/kisexozupuk.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8767bbc244---13929809966.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/89873497bddf735ae9b66d5ff1c3b36a/47880496046.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/87569938220.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/72021187602.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/76898396574.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/16894653001.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/vumuvinefupu.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/fijobirupum.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608367e01bb19---lidorobogodakasod.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b6c0a1bfb---xekusegixawarar.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/87430912504.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/23b0d2c4ad0f8831196622b4415cf93f/89459114800.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/fa14ab78e9144b0eee1cf2e0c3ee6b6d/75086033070.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/lkbd4qd5htiiqre583eeau6165/9643714192.pdfIn PDF document text
    • http://mesahighclassof64.com/clients/874441/File/raxibinotijopivido.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/qdb04640e3u1nb24es59bdotm4/jemuzenigogudonexele.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/17a977ba2474d451c297251a28c439cb/57512392620.pdfIn PDF document text
    • 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_off0000f255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF255 16492 bytes
SHA-256: 33f5ada0dfa1906d6ebdc32f63d8d9b20a7a7edcfcd8f01c46a326b464a3e781
font_01_sfnt_off00011d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001354c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1354C 10784 bytes
SHA-256: 03de6551da5b84199a45d8a269e7658496f08e1103ba3aece3c7e9e3a063b275

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