Malicious PDF — malware analysis report

Static analysis result for SHA-256 f099a3084bb34192…

MALICIOUS

PDF

93.5 KB Created: 2021-07-24 18:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 357e42912b7257458555b6ed2e3b5cf2 SHA-1: 511ab00e229dcc41718e4e50e7d443a781c57ef2 SHA-256: f099a3084bb341922c3e65a0e6eefc98ce73e5f22c479f8d7f9cddbbb6197630
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites through a link farm. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mt-creativestudio.com/ckfinder/userfiles/files/27188984057.pdf In PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/45131337133.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b045634651c---91086388673.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/fopunikurewuxojebesusejad.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90717bba6---96168703163.pdfIn PDF document text
    • https://t2sc.me/userfiles/62118958562.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/4eo5hdg47v42vbpaupb9l1c147/29355645487.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9c1ec9bf4---54558844608.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad91a689740---11694464532.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/rabisigiti.pdfIn PDF document text
    • http://tipiland.net/upload/file/palorivofopiwivi.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/59584079581.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/16f32f421d106d7f7eb3167c600016c2/zunefube.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/de64036a7595d1a8cd33f2ce6ac6ecca/dimuxubonoso.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/5b75f339a584c7867d3aaec14ad7a7bd/nigajukosogubozupomed.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/cbcf80758beb38572505806349fecb38/80324761025.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/vadafofo.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edae253c1fb---xutuxinuriponigudazejub.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/11686149372.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/60912777191.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/37953341717.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0946a95581e0ae6c8638dd4b663866cc/razifitejifavujewabigid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=what+does+a+demigirl+meanPDF 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_off00010ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD1 10688 bytes
SHA-256: 4b4ee414182f8e413bd71634743d8f7c425f4bbdda2b8193219430d2b9ab12bb
font_01_sfnt_off000122ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AFF 16592 bytes
SHA-256: 934b59479dea1460986c4351a38ec05a8acb2f3f69c9ffaef4d7ec0c7b0467ab

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