Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad832b1651815840…

MALICIOUS

PDF

81.7 KB Created: 2021-09-11 05:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7cf88e40ebd84145ea46738a27cbeaa2 SHA-1: 05287659a269dcb7b76fc327d01b9121652b1ebb SHA-256: ad832b16518158409152a0d6dfae99056f8c29909fc19929fd3acbb4e24606d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://crysiq.ru/uplcv?utm_term=sat+practice+10+answers PDF link annotation
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/886def9457d485b48caf9693d37a1e0a/fiwojareribaf.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109020647454801.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371902a2796---litunodetafovukosatalijik.pdfIn PDF document text
    • http://dalaichau.com/files/darutizudorilexavivuvexut.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/28148429853.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/tusagos.pdfIn PDF document text
    • http://ipllaser.in/uploads/salakemuwonufusodovulinow.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/qtcqoj4om70373db2h49ul3l80/fenasogifusadotizesixupo.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091018582420.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/muzisinitosanogumexotip.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/75392903547.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/banozerudubivufajojonaj.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/88239161625.pdfIn PDF document text
    • http://imoroz.by/upload/file/tatuluzonozebojagizenak.pdfIn PDF document text
    • http://only-svet.ru/upload/files/dofimerexoxegijomuru.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/99858813211.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/22575651246.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/81735005802.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/16e6de5a5d7540561d48d3fe59d9a150/fodero.pdfIn PDF document text
    • https://umutfm.com/resimler/files/domal.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340ea106da0---13381152936.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/31155590152.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/xobakaruturisimegodan.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/12748769301.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/jinov.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_off0000dc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC93 10536 bytes
SHA-256: d191864c855106077203b048f79ba12c1d122c22f22b02653c6d795b82caf5f5
font_01_sfnt_off0000f4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE0 17296 bytes
SHA-256: 0acf3928ff6b44c883894eeddd9a28da4b91d160a7b292016d121e5b3ca0a77a

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