Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0e4e3630f1a299b…

MALICIOUS

PDF

87.4 KB Created: 2021-08-11 13:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 98b5fb3bf8f23a2ca261bd14d14de6e1 SHA-1: 83c9fd0cd169c3086a0400945eb2b59bab2c19c3 SHA-256: c0e4e3630f1a299bb89b482f841a23878f2118b4d62fe1cab44cc33237999162
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. These links are likely intended to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160a6adf1d04e8---xuxeloz.pdf In PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/84532172243.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/33494944838.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/74520083038.pdfIn PDF document text
    • http://jentretiens.ch/uploadimage/82375202476.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/ec9297396935ebaf4f53f6f7789d3927/79425740038.pdfIn PDF document text
    • https://eternalbliss.net/file/26489094813.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/c2ed38cf7554432a40d8c29e142874c5/66203600506.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/a0b3ddc899fc265cd2e4858d7a0a2ac8/70894727265.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4a1e56c3c---zixatotaxi.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc015fb00d9---vamibewasobavakugabewebid.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/925ce48caad971b58f060686f45dba32/kofemavaz.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/10891133369.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16092edb9abb3a---47355742451.pdfIn PDF document text
    • http://adveotec.com/img/file/15125164213.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/jurajawuvova.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/5bdmjgf17hi6nv9e8m69fgnl85/xesen.pdfIn PDF document text
    • https://vestol.bg/files/file/litefowumejojuzupugore.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/jogumudamitepaxo.pdfIn PDF document text
    • http://uci.ir/userfiles/file/vavivevexo.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/53146026197.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/5817k62detobbg7vclatfpmfa4/82449738842.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/rf70lgr8m9s460dkpc7gvjavdl/gesuruwunirati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=what+is+the+difference+between+fission+and+fusion+answersPDF 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_off0000ef2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10743 10848 bytes
SHA-256: 9c638cf9256f4399df05919c38a81c09511d068319e919e1b1d808d4554207b5
font_02_sfnt_off00012050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12050 17328 bytes
SHA-256: 9f79fbdb2607f5ca8cf9780231b99903e3550ac703ed33c12889512f587a5c8f

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