Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d16c3c3266020f…

MALICIOUS

PDF

86.7 KB Created: 2021-09-03 17:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 96cfab1206e28e2c6e1592d7c57a48da SHA-1: a2b8c57ad41968877a46b2cd1ca50583c45eb229 SHA-256: f1d16c3c3266020f7cfa395b4ca19e4154a4f84ffb084c398ef2d3bf4ce96ecb
204 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript and numerous links to external URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing payload or exploit. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • 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 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.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/4c6129a09a4c5ef6f9c28a35209e8bde/55710741138.pdf In PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/taworapatilexavusigib.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d453892d17---47119167155.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/xobufepom.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/9rkpcr9sojoquk57dnba5peabu/suxujuza.pdfIn PDF document text
    • https://defaico.com/d/files/vuzatu.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8170c359e---984483532.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160853c62ebd63---89865019455.pdfIn PDF document text
    • http://rhondachem.com/d/files/wotilizorizusen.pdfIn PDF document text
    • http://japhina.com/upload/file/40514482977.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/16534571373.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/51410380798.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160741e154557f---bakewadetow.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/33591989338.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/cf154e470b63d461ba55539e51e6d248/35919922253.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/8pl7hr2a781kqllg3q4s6t5l60/94496422803.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/1fea2a544ca60dd04e98281a94d54523/fupik.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ab9fe499e---35232318497.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/84869826762.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/20873852041.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/kajalajuxuzinojikere.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/2076309295.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/17124329042.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/datogediwoluduw.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/76epr19bvrtpcmjenng5e4khv5/jevofidalokuzebojaruka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=come+modificare+un+file+pdf+bloccatoPDF 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_off0000eaf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF5 18580 bytes
SHA-256: 30ca22afed6f195aafbf7f6f84af8a36691aa43cd9a23c09e5dbcd0bfc96f05a
font_01_sfnt_off00011c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4D 10884 bytes
SHA-256: 62b8d5b962d7305060d6a6d4e74c0599c9fc94d112ead36f04f0824617b28b4a
font_02_sfnt_off00013537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13537 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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