Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff98f7335828ed5…

MALICIOUS

PDF

67.7 KB Created: 2021-09-24 13:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 24d9483765bc4d533962949a97a7675b SHA-1: 678be7bbd41b1826137af359dcb873c442dc28f0 SHA-256: 4ff98f7335828ed511e8bd1ee42550ad5dbf39814fe9d08952c1f905d54ff871
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and flagged by an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it uses an image-only lure with clickable actions, typical of phishing or malware distribution. The numerous embedded URLs point to various domains, many appearing to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 0 text block(s), carries a click-outward action, and is only 67 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://infrive.ru/uplcv?utm_term=wrong+turn+3+watch+online+free PDF link annotation
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/sinipebaguradofuz.pdfIn PDF document text
    • https://harom.ro/files/file/19341755499.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/69611323280.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f95fc0de8a---kamaliwu.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/28853184172.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/wutaguvadafuvepefo.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f33e281094---26697258717.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/d5dfa180eb58d52aebd2b67ee9ce4bc1/89854336172.pdfIn PDF document text
    • http://citty.org/images/uploads/file/40245122609.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/75287711826.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/xupagoduvepenuku.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/71182899933.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/60095924209.pdfIn PDF document text
    • http://patroha.hu/file/kutezibokinigukefumu.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/datelutogogewowijoju.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/bamifutimo.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/gedawepivabejo.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/ruvutuk.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/gunamojos.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/taniserilexejo.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/39855359397.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/dabegupetifezilefere.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_off0000ad17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52E 10800 bytes
SHA-256: 16eb7f4dab26cb29cc4a0cfaa8a3980e491ab6999f489fbcdb2bbde3289a7bc8
font_02_sfnt_off0000de18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE18 14212 bytes
SHA-256: c848f5fb7468794796f3f3d89288109eb4e5647e8eed49beb13eb04679352828

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