Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec063b520599975b…

MALICIOUS

PDF

76.1 KB Created: 2021-09-18 01:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4383d88f5dddbe509d19ac25ac05777a SHA-1: dcb97d8706dc9b801eb9fe3c49266f6d0e4d88d1 SHA-256: ec063b520599975b2136d781eb4b36bcfdd698f4987d1f9143ba18bc7b02c4a0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a social engineering attack (ClickFix). The document body is heavily obfuscated, but the presence of numerous external links, some pointing to compromised CMS uploads and disposable hosting, suggests a phishing or malware distribution attempt. The heuristic 'SE_CLICKFIX' indicates the document likely instructs the user to run a command, which is a common method for bypassing macro restrictions and executing further malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://www.injamal.es/nueva/ckfinder/userfiles/files/guvijesu.pdf In PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/33856309869.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/vaturufujigalutesozivi.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/83695745246.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/94cb65d6a4febffea35888294d03feec/60946459143.pdfIn PDF document text
    • http://soupworld.de/upload/file/6099574248.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136e2b552d19---liwituxitiguwedilogo.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/20483219880.pdfIn PDF document text
    • https://sanidom.pl/img/file/34861874068.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/40536494771.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/65780098233.pdfIn PDF document text
    • http://att-na.com/upload/tuzeganewemaze.pdfIn PDF document text
    • http://hmed.vn/upload/files/82704124754.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/mefixakubudinikowopifub.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/0f923e09f93542964de086d720b5d890/67734863413.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9426b91c3---sunobejeziruvezabe.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/teruxebomelarididinapu.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/tusaxex.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/jebibakepoziperiregile.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/62008119716.pdfIn PDF document text
    • http://clingac.es/d/files/fidaxaxaxitokalewupejoro.pdfIn PDF document text
    • http://klinok-saintp.ru/files/67988939142.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/92790065192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=imo+voice+call+recorder+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D5 16568 bytes
SHA-256: 4e578d29d7d2fe2f966a7e8af4e6958932e48a1e4954236334fcd3f5914054ae
font_01_sfnt_off0000f2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF2 10412 bytes
SHA-256: a0ebf803e0bbade5fd14c5d11e7c90af4ee3bc928de8378cf31df1a3313982c0

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