Malicious PDF — malware analysis report

Static analysis result for SHA-256 278bec72b79c181e…

MALICIOUS

PDF

76.5 KB Created: 2021-09-06 08:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2bb402aecea76e05b2abdb391e846fa6 SHA-1: 0e18d3e48655248f322782e8538e94350122248a SHA-256: 278bec72b79c181eebbd787a2fbc3ac006395d2d62c2fbb6aa1d69e98e7a67b9
176 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. It contains numerous links pointing to compromised WordPress installations and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, but the presence of embedded URLs and the heuristic firings strongly suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16095a3fe899f5---zixesijufulu.pdf PDF link annotation
    • https://hizlipin.com/calisma2/files/uploads/pafemobuwupazosorulidu.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109050327369902.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/cd842a34d5ad7a1c4c90625a6ab16358/30178376707.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/tedelibusovimexamixituti.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/3hugr6vas9dh1ninma73q416ec/pexijigimakezobujuge.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/29405a67cb0f8ff0a9fcd0e23f6cdeae/darapuzidemexibuseve.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097ddafdbf04---25955529245.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/169bb0d99610c6778074dcb3e876aacb/zefapatadifofuvoboloxitid.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/jipajoxufatadatavikazu.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/fomibitogevawivizu.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/82b7dc37f7653ae25ca54d7cb6060f1d/timosis.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/47101668234.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc69de9350---mubenapuwivijifujevob.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16099f4cb79fe1---47622705876.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/65483070226.pdfIn PDF document text
    • http://heureka-cz.eu/files/16317480664.pdfIn PDF document text
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/wemumew.pdfIn PDF document text
    • http://turatabor.hu/media/jeriwaxidobilega.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb69ecc37e---zibimeborotabizebekawiz.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/65e74718c5a9ad63dd5fef2c329d1e7a/juzixajisatutemute.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/60348153454.pdfIn PDF document text
    • https://tavio.ru/files/file/75033784928.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/83849892735.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/23c263a473c3888c2adaa09ea8c40e22/jakelegawugawatikerumov.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/bexusezufeduporesiwusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=third+sit+report+on+black+money+pdfPDF 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_off0000c821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC821 11192 bytes
SHA-256: dfa24f1de837d654739c26e6baafb4e0e07428a62d7e964a6ce0311562422f26
font_01_sfnt_off0000e1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA01 16568 bytes
SHA-256: 595b604fbabd9e68abd0e31343a8e36511451401b0f288498660c3a7da943478

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