Malicious PDF — malware analysis report

Static analysis result for SHA-256 2526aba912d94919…

MALICIOUS

PDF

68.2 KB Created: 2021-09-30 15:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ebcfeb59a84c43c2afdb4942599da79f SHA-1: c01a6588f59dda76342e1112732766ae2bdd92d7 SHA-256: 2526aba912d949194bcf135b3e3755f1797ec30b4def5ce3a23e3a4b775af003
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous external links, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The document's structure, with a single image and minimal text, strongly indicates it's designed as a visual trap to encourage clicks on embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • 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 68 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://irlanc.ru/uplcv?utm_term=wipe+system+cache+android PDF link annotation
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/af8337d6ca7dd8b31ba315ff9e8207f3/daxoj.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/45707683425.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210916_25A429D35F4F0D83.pdfIn PDF document text
    • http://ipllaser.in/uploads/3625770128.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/10741241264.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/bitiwagejusewegagebos.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/31548806218.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/99980410280.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/37977951824.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/sorerotepalimebi.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614fde5c5224c---17714249206.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/tizawotufilileli.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/zuzafusegugitozidinamijub.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/91970905896.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/45183271503.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0d7ce2997---jifebejarovomozob.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/13424459064.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210912002933.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/74467541630.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/fopibibin.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/59069215623.pdfIn PDF document text
    • http://giga.sk/storage/file/mepomadomamunotetoxebos.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///56889010733.pdfIn PDF document text
    • https://simorgh.it/uploads/file/vajoluxuninojodaveg.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_off0000af1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72F 14252 bytes
SHA-256: c154f308725b62ceb3f71ba6d58eb8294900a9900286bad10fd2121febf4c2ad
font_02_sfnt_off0000eaac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAC 10840 bytes
SHA-256: d66da08846c8d49340fd40b38c3bc84ec243f0a9adcc17f2ac2004a2c5ba3a99

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