Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f6d581d64fd442…

MALICIOUS

PDF

75.3 KB Created: 2021-09-28 11:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0525c0c195e62ce42cc1d07e37f02fd4 SHA-1: e0b81263267b532fa11c688db588313b4a424a67 SHA-256: f1f6d581d64fd4427b6fe5d47e18a71ba15befd904f056a2fb993399f14a026d
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. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of numerous links and the nature of the URLs suggest an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=trouver+android+google PDF link annotation
    • http://abwclayton.com/uploads/files/kixulixosekiwovinumun.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/11352983208.pdfIn PDF document text
    • http://rayanchem.com/d/files/31229494574.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/wajogexiko.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/finepajuxewafovepuzubul.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/7189144707.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/5667181181.pdfIn PDF document text
    • http://millenium.moscowfashion.net/content/xuploadimages/file/23221116922.pdfIn PDF document text
    • http://pilot-nav.com/ckfinder/userfiles/files/84975607488.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/gewub.pdfIn PDF document text
    • http://quesnelfoundation.ca/userfiles/file/50949656144.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/82186976728.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/voxaxivop.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-4/20210904133614646153.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614319770d635---55551002084.pdfIn PDF document text
    • https://activepymes.com/pub/file/nadufofanumagadesalus.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/vimuxovotipulogebovel.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/3ad11c4c2514e397cc2586b989c892f0/85576342161.pdfIn PDF document text
    • http://homesunshinepharma.com/upload/files/lidetenemogujibogiwav.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/cdb6d29c568ec038d6937244805eaabf/48799896182.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/78032428328.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/kewuvivelu.pdfIn PDF document text
    • https://csodamalom.hu/files/files/wakabufav.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/s3dojfb5j4a2nqrd9vvs5imh9j/65009708554.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_off0000c091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC091 10288 bytes
SHA-256: 051466e6856822fad77f5ca83a3497a2aca11e80df767e822b9d13a695b3c0b1
font_01_sfnt_off0000d791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD791 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA3 18452 bytes
SHA-256: 9dabb04c57028883833e65e57e0db8a44e85301dbf9d070d386c26921e4bad8f