Malicious PDF — malware analysis report

Static analysis result for SHA-256 44b2f9a33dd1ec2e…

MALICIOUS

PDF

79.9 KB Created: 2021-09-06 18:36:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 26d4feaf1491a204380d9ddb5766ec5f SHA-1: 9772594ac732ef6345d5813b69e70a49dde85428 SHA-256: 44b2f9a33dd1ec2e19a07b757d26f9bd3834a41c7cbeb1b3327bb3489fc3914b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • 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.
  • 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://bularz-auto.pl/images/userfiles/file/97124853663.pdf In PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/94331720543.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e8abb371a---25308003155.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d2df480e9---vijirofo.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4727d0739---pidulanasokedupewasi.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c52b066caa4---95058303287.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/dajux.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/gusirunelanesugefixowabem.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/64luae1397uuuoaolnlk4h8bl6/xurixevawasefukoju.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/84918133116.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/dbedf9b1639b74307157f08898c18b6a/58624564021.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/55a8db042b47c0201ce6b53e214aa7b6/76526480916.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/52452433036.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41175cc6a---gizuvojaw.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/65760731075.pdfIn PDF document text
    • http://charivne.info/images/file/monaxaremalowakeratasax.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/lukeginafuzexukutune.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/8e350f9c0d63bbe6337f9a198fbd4c44/nupewatexuteletetomuf.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/4599f61b6bee30688caed876c4d95a97/ruduparufasonisop.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/7c9d1fe2ec9dbe887a24452747a805d2/falineweguxejapijat.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/98808671227.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/puxanetu.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/16229839164.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/48243834c8ca8a9fa83a075d3cee5e0d/79212812166.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/7najevuh7n3agb211jc9ec2iec/rosupeweduruz.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/6shpi0bn0efgnkjkgs2glq56d3/kemotefuma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=dragoslav+mihailovic+pdfPDF 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_off0000c979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC979 21492 bytes
SHA-256: 13eaa0bcaa64c646520b5096ddf72aaf8b8658e599e5cd1fe0e7f434e3c1d164
font_01_sfnt_off000100e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E3 10800 bytes
SHA-256: 9aa320abf8f4b5e715235452e9dd7a65ca36300c57bebcbe55b09d23b360dc4d
font_02_sfnt_off0001198d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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