Malicious PDF — malware analysis report

Static analysis result for SHA-256 45aea9439c207898…

MALICIOUS

PDF

84.6 KB Created: 2021-09-21 13:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 233e25d9dfdf57d5abe5edc5c128db6c SHA-1: dced23638f3e05807e82da1821ddb8b62f317f9f SHA-256: 45aea9439c207898cbfe416f379310ae9f43ca432d95141b5c089f715a762ebf
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it's a link farm pointing to compromised CMS uploads and potentially disposable hosting. The 'SE_CALLBACK_LURE' heuristic specifically identifies the document's intent to trick users into calling a phone number, consistent with phishing or tech-support scams. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites or initiate fraudulent phone calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://sunriseinnjasper.com/nbloom/fckuploads/file/44316641623.pdf In PDF document text
    • http://haiannweb.com/uploads/files/xabafufun.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/bokefegales.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/21970027352.pdfIn PDF document text
    • https://grnca.org/img/files/files/86141051923.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/zuxiganokatulogalade.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/67489580908.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/jewoxobunodi.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613548ce1191e---59233642014.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/61642325861.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/razudurenamegaki.pdfIn PDF document text
    • https://tavio.ru/files/file/58881958649.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/44466795669.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/54731582263.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/35781027848.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/36465557861.pdfIn PDF document text
    • http://canadanur.com/resimler/files/52387971830.pdfIn PDF document text
    • https://www.confirmedtour.com/files/dunolatikeromibame.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/bifuf.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/4587304104.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613766315ecec---60176607109.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/65362513954.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/81467057801.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425b08a2314---galasuxenid.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/70393054677.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+recover+old+photos+from+old+phonePDF 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_off0000e619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE619 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2B 17768 bytes
SHA-256: f7f8b258a48ff367b139e166379e896930ff8456ccaf4b42571536f7f7e582f8
font_02_sfnt_off00012bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF0 10776 bytes
SHA-256: 225a9afb13f46c404bf48648e8bb93e6ffc2c0419c7cb792874ee9338a2fa05c

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