Malicious PDF — malware analysis report

Static analysis result for SHA-256 68b31ec361ab3d9f…

MALICIOUS

PDF

104.2 KB Created: 2021-09-08 00:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: de0c216d28d3d4cf791045180b1bf18c SHA-1: bb27acd7531df8fd07e102d87feab6937cd51123 SHA-256: 68b31ec361ab3d9f94a72002a30874536439e5f49675a5eb5ae736ffcae148de
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple compromised WordPress sites and disposable domains. These links likely serve as lures for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://93564497.com/userfiles/3533710239.pdf In PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607963c4b7a49---97245799501.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ef8b33a21---gupirusatavepa.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/b6e093df8d3ab9ab144ff1fc6568ac02/71649517613.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/vuparekibidezolakaxuri.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/59252766121.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/caf839ce670380d804747da21efc9bc5/10753588573.pdfIn PDF document text
    • https://comfort8889.com/upload/files/mepoxug.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608135d1bac5d---gelupixinune.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c58028a970e---16713679910.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/56296206261.pdfIn PDF document text
    • https://whereestar.com/marinarubicon/admin/file/riwazikukipapofev.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/vixejuluvadazarewudijo.pdfIn PDF document text
    • http://whsclass1968.com/clients/f/f8/f849445bb2fb8f42e7c863050dc1ba38/File/sosupu.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a883f2b8bc3---81854460579.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/79027814028.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/34961619168.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787ca8b0986---fizadalamuzoso.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/mebexosa.pdfIn PDF document text
    • https://ghnservizi.com/file/68907562787.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/zutovusonawizoguvikajax.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/nidaditeboxudaniz.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/zafafikavawapeleweruz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=geography+notes+form+two+pdfPDF 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_off0001317e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317E 18708 bytes
SHA-256: 4b8ed27bfe3a898a811ec93353696b496ebf440d4978c7ef903740cf60e34189
font_01_sfnt_off000161a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000179c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179C0 11048 bytes
SHA-256: 9a5c95428f7934b6536b982a086504c579b7f231fb3ee055809d9b4bd37c3693

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