Malicious PDF — malware analysis report

Static analysis result for SHA-256 81041fe6bd9a84d6…

MALICIOUS

PDF

76.9 KB Created: 2021-09-21 16:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7f73bc332671e1b6888a920c11a92f1f SHA-1: a49909df5a76154a0577f888c9f42bf7702d8e67 SHA-256: 81041fe6bd9a84d671f739a938c56cd218723de75312f429562c77c2f6ff6cec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. It also contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm used for phishing or redirecting users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/511235305b07522e95dc9eb21284cf26/tidizunipala.pdf In PDF document text
    • http://liyangah.com/Upload/file/jepugib.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109191150362466.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/sugusivolotaxizepile.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/21783276663.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/87291810621.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a52a624df---42836696183.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/12131765335.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/66057101664.pdfIn PDF document text
    • https://penal-garazh.ru/files/54218702633.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/58729387529.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/4531142790.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/ba614fe1bdba6c0649acb65f2deb4520/vapaxojesupunabanafu.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/84894302873.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/15ab42071f3d611e1f3ca4cc634c1b30/48640426444.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/linatatibepujibujodowimob.pdfIn PDF document text
    • http://slsnn.ru/content/files/72185546492.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210916012628.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/70573008776.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e8294a0ce490502dc088263f09c3b6b7/57325473813.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/jegamizezinifimokeju.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/rireruxazimefad.pdfIn PDF document text
    • https://anup.bo/images/files/dadalamifutij.pdfIn PDF document text
    • https://moolans.com/uploads/files/23919771838.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/18191624668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=roehsoft+ram+expanderPDF 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_off0000c670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC670 18124 bytes
SHA-256: 53d89a05051cd077099d7e0033966104a36c45734e968f39aeff59d4efd36a06
font_01_sfnt_off0000f5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCA 10772 bytes
SHA-256: 028d6cbeab80b75bf525f8dc4630aa8d8c8d8a56451dbdfc5d3c1de75f838bfa

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