Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e75933c1592db5…

MALICIOUS

PDF

70.1 KB Created: 2021-09-25 20:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4dc80cdc1938d4ec285ad51d9ffb4216 SHA-1: a71232474a847b6f51b1d28a85dbeb5e72753e5f SHA-256: 99e75933c1592db5b39de61f6877555b7d57fb77a09a21fb7512561e2c9ae398
216 Risk Score

Malware Insights

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

This PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a link to a compromised WordPress upload directory, which likely serves as a staging point for further malicious content. The document body is heavily obfuscated and appears to be a screenshot lure, designed to trick users into clicking the embedded malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://huntic.ru/uplcv?utm_term=using+iwatch+with+android+phone PDF link annotation
    • http://debten.net/UserFiles/File/17585281946.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/feragafanogukusatewol.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8202d2258---90571691142.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16147dc9abf175---wavofodakenisali.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/34083580984.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/nulakowevikexivip.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161444c8f4c050---5852008363.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130985f32877---36752080502.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/243a09b179103e08d7333aa8d958c040/xaterifujuzoti.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/7bcccbac8195639c5df778ed90c9b2a3/pokizamimaxajel.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/fajozidowaruzuwewuriz.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613baea626292---risewagexanufuzavituxisu.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/pepevoto.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138bf1ca3389---xipidimimoborogupejanewup.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/55072687701.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/kaxixaditu.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/24542323531.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/gedisumilogalaxuvewa.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/13840065193.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/volilewibunamamaxenaki.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/99440489478.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/narezeworukuvasoso.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/70554455166.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210916131301.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_off0000b5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFD 14332 bytes
SHA-256: bbed7bc6b80edea4927240d2f561e0de3838c9a26ecd586e1dd9195baa09daec
font_02_sfnt_off0000f1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CE 10840 bytes
SHA-256: 2b162e1f1f90deb76879501f494a2dae477ad7cff016a32bfc97816500bd10ff

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