Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5303959f38e390…

MALICIOUS

PDF

82.5 KB Created: 2021-09-12 18:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bc4202e426b61c168b95318eb3d9e048 SHA-1: 2936355bad4064007c4e28c17757892e87d111e0 SHA-256: cf5303959f38e3909863dec1662608f5a447923a69e09d6bb1825881c157e651
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs, many hosted on compromised CMS uploads, suggesting an attempt to redirect users to malicious sites. The presence of multiple external URIs and a link farm heuristic indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/9hppo1ve1viu596t9p7590a0gq/goremiwineke.pdf In PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367b8c9fdaf---72066535815.pdfIn PDF document text
    • https://etadelloro.it/images/file/seguxogog.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/wusiridiberarite.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/55605747823.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/milavamegaj.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/6080693209.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210902142709.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/bipenigodukog.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-11/20210911185803749864.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/tuxufolubajajisuxazada.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/52280027496.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/91791380209.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/26702902672.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1016bbb00---32662853981.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d03c8e9f7---63033871846.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/sirimamerezexuk.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/bovunebotob.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/97801057526.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/70563555183.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/16741948647.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20133216035.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/jurifuruzufe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=pocket+fm+mod+appPDF 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_off0000d8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E4 19916 bytes
SHA-256: 8b6a79af509d469c3af8a00b1bda31dce311aa9541a44d0fd7633d17e2a54b88
font_02_sfnt_off000124fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FA 10364 bytes
SHA-256: 25f57aa1cebf44479d5fe18892e5d7b3eb51b5fee58898ec86e0ae885711d5c0