Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd276bc59fb3191c…

MALICIOUS

PDF

79.7 KB Created: 2021-09-20 00:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2fbcdacd9a6cf22874309b2f4059b40b SHA-1: 3d7d8583e21888e2cdf752c11e0894566544faba SHA-256: fd276bc59fb3191c78e3f7b0ff0cc13d8c58788fbfa20e98376754227cf5d624
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading malicious files. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with a high ML score and ClamAV detection, strongly indicates a phishing or malware distribution attempt. No scripts were extracted, but the overall structure suggests a lure for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613678a9c3727---vepelibu.pdf In PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/c95b8375032de9ca745c46c513c554f7/27113650846.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/nexidu.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/fujusinetad.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/4137204225.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/nogexik.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f36c5df480---49757477126.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/zafeligotuxufexepelu.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fuxomigujakitome.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/51069244559.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137bc10c98d2---20690894316.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/lofifamavujipasovodow.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/gufilezufevidotugata.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/lojewikijawufebiguwar.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/boxigudevariwofogeso.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/45297717371.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/15725588960.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/43005874584.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/bolatofakemexotabo.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/taxelateramod.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/40298939478.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/xusesarakojinora.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/gixoxuvepomatituwizox.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/lipagiworonur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=download+spirit+run+mod+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC21C 10700 bytes
SHA-256: 33285100e820a0ca00dfc11ae9e644c6bf26d1f7ce74660818c7a11820fb77b5
font_01_sfnt_off0000daaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B7 1840 bytes
SHA-256: e11639021ae82bc81d66597892112dbefd7f2cb67f426bbebb6fc3c29591e729
font_03_sfnt_off0000fb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5A 21628 bytes
SHA-256: b6e69d7253fdfa2f94de1ec537d5d64cd6b23bacb6c35b6a1461164ee99f1bc6

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