Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb96d7c89af42410…

MALICIOUS

PDF

90.1 KB Created: 2021-08-25 16:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 10534fbd988279b4348896d5bfe3c8d2 SHA-1: e7949cfb82a8205f67ad59d46bffaba478f1b115 SHA-256: eb96d7c89af4241010cfe4ec58db8a020d44622ca7e34f9db5a0f5198bd7485e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress uploads. The presence of these links suggests an intent to redirect users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://catamma.ru/uplcv?utm_term=the+croods+a+new+age+movie+online PDF link annotation
    • http://bigredclassof1960.com/clients/879476/File/xufiberozorilurabuzinu.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610d1482602d1---muwidorelabus.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a4509ab68---63498506288.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/7dff87a69715b4b9fd771ad555822a4d/widosarevegibifopelewet.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/5a89d2fd19e0b84bd65933556d8b6d95/laxisefi.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/xibonupofopavubij.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210823_210129.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c823516b9---wepobiwuluxop.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/12qae59fojpfee858pjad3vbvb/46661362068.pdfIn PDF document text
    • https://edcasys.com/ci/userfiles/files/32420208940.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/foguxigeru.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/2cd084fc911ea8df04a8d96e65fc271b/sipasez.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/matisezo.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/33703443692.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/69590535109.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/boxisejik.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/1e8bd45d0dbc33e4a0228a3daa045e5a/dubuvuxewi.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/sujalomon.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b842aaa643---81973878683.pdfIn PDF document text
    • http://teaneckhs1977.com/clients/67867/File/51037456209.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/18288475334.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/96381654270.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c76572cf12---lamef.pdfIn PDF document text
    • http://seritour.com/rsm/files/zokotadexejegepojapi.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/vijamexomenusud.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bddd01c033---wizixikiravonaxeb.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_off0000fca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BB 17088 bytes
SHA-256: 2782c079f3edb12d1d73a0c75e0621cd8934b8a2696cdf5ee73d492febfa9588
font_02_sfnt_off00014138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14138 10836 bytes
SHA-256: b12c887c668e4418624b7ed17dca44dc8b3ae549b5b46c6fafc412e6c39a962d

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