Malicious PDF — malware analysis report

Static analysis result for SHA-256 71f0470f712e4fb6…

MALICIOUS

PDF

114.3 KB Created: 2021-08-12 16:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: d3aa7f949a1164d85a4d50419c85a1f2 SHA-1: f6da02db36c6968c1139d2dba90dbddfe9df1b3f SHA-256: 71f0470f712e4fb65c2b3fe0b15c5c9332e014c4e69955d1d9c759f4294bf0ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classification and ClamAV, indicating it's a phishing or malware distribution attempt. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://philabc.ru/uplcv?utm_term=oraciones+con+sujeto+y+predicado+en+ingles+y+espa%C3%B1ol PDF link annotation
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/f537608393bf10017abf55119f1b20c2/20212906331.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/fixetipesep.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9b348409a0---ketikezizanazubovedijom.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/31867024138.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/winozekediwibujarigema.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/3b1d5f4dbe643419b604ca967dcf4153/10830324706.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/mubikog.pdfIn PDF document text
    • https://equalland.com/uploads/File/viduxizomubexajenizipag.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd28ea8a1f0---jokanevatizixokinukagon.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fe909f52a---21674537999.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/a56387341124fbbcd90307dadb2dc909/1445783742.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/65465223386.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/bc0a79d6009400a31acd966cabaf3c2f/83206529813.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/9nlrjg0fdc952tr0msb1epvdh1/11201071985.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/nepepadages.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b467e9747b4---86815480630.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/nipevumozobupijen.pdfIn PDF document text
    • https://mszukam.pl/dat//file/35789560427.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/zirujox.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105c6ad852a9---xonodigopofanazopoxosij.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072959a62a2e---56220135995.pdfIn PDF document text
    • https://iword.de/userfiles/file/25682416536.pdfIn PDF document text
    • http://forum-auto.ru/data/files/zujexogezakabiwepasojole.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_off00015924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15924 17204 bytes
SHA-256: 6bd597326bd0a0d11837d03f3555e56e4bbb113dba6492d5b34a750799b5e46f
font_01_sfnt_off000185e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DFD 11264 bytes
SHA-256: a7ba7141955fe4867083b73bf33e78b460e912f7c3ba12c150bb58dc47078d3d

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