Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f238f2985efd3b…

MALICIOUS

PDF

87.9 KB Created: 2021-09-08 08:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 237a6e970e693836485d0cb680a11e7c SHA-1: 5bc70f57753c147ee8aa2b8efa95db0efda352fd SHA-256: f7f238f2985efd3b3e4b36674807e5716e42610169c960755b68ca73aa52eefc
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 by an ML classifier as malicious. Heuristics indicate the document functions as a link farm, pointing to multiple compromised WordPress upload directories and disposable hosting sites. The embedded URLs, such as http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075aa0d87f34---36188766093.pdf, are likely used to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/7b618f08b633db6b72e1d9d0ea349f63/kugoret.pdf In PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b1debba8d---pogunovifafuriwulate.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/jotar.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae49801db2a---43556064889.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/famepefoxiboxipakoze.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075aa0d87f34---36188766093.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607816764c5c2---30580408587.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/64967662902.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/jh1i15os7sls6s4g417rpqoi5p/miwetubejebirulut.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd57e66ac98---gaxibesifumibetipuj.pdfIn PDF document text
    • http://recviem.ru/img/upload/18724042439.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/75160970281.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/tibafaluketinojeduvo.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/zokulidagorebefabonoxadu.pdfIn PDF document text
    • http://janatalnajaf.com/basefile/janatalnajafcom/files/67914479103.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c719197421c.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/13957487649.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/kubudataxatem.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/xomidawavodiseruseso.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/fumurerixufago.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/10347175965.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715223b5098---kafofulegujikegeribazot.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/50576514770.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/sikezofobimedudu.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/d8b65a91bc2b12fb2f735c0094fc38a9/42982726159.pdfIn PDF document text
    • https://new-baby.me/userfiles/file/33270982757.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=ultherapy+machine+manualPDF 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_off0000ee3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3A 10572 bytes
SHA-256: b18f5abc05b6c354c802fdd766a2779d55639f9d09ff726ba08bbb3c12f5318a
font_01_sfnt_off0001062f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E41 19816 bytes
SHA-256: fffdbf8c3bf7bbb3e056ad691312f2ce24d92f34542bbd6d467a951914aea606