Malicious PDF — malware analysis report

Static analysis result for SHA-256 f98aef2def06cbc1…

MALICIOUS

PDF

97.1 KB Created: 2021-08-14 23:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a7ff15af0f319b2648fc9f2584b5183e SHA-1: 526c58bb5648d98a82e1a2b94a8f6d179a35c9bc SHA-256: f98aef2def06cbc1e110c0676a5986fc0ae879ea078b3a61475548f5ad9c292f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic further suggests a phishing or tech-support scam pretext, likely leveraging these links to achieve its objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://huntic.ru/uplcv?utm_term=lecture+notes+on+mathematical+olympiad+courses+for+senior+section+pdf+download PDF link annotation
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7804d9857---31992521774.pdfIn PDF document text
    • http://tunecharts.com/userfiles//file/mitovazufatodada.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e954aa92c---gopepefexibawobiziru.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/wogowoxumelovu.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/tojiz.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16087735539e8a---zabuv.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/cb31e04786b8a0a6367803930631ee23/vaxisalopanitabagu.pdfIn PDF document text
    • http://www.puhito.hu/uploads/gevujufojuduzijusokodi.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/4bd75946c5382507ecc44dc8cd4a53c8/sufilozutizeja.pdfIn PDF document text
    • http://bruisedreedfoundation.org/clients/4/4d/4d9d7eec3bf3a09fa0457ace138f6a4e/File/titines.pdfIn PDF document text
    • http://www.emailposte.com/pictures/93563929871.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/41770458365.pdfIn PDF document text
    • http://bociany.sk/media/file/13945965176.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/25266954770.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/45417207719.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcc703dbc8---84815818975.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/pep3l3qjn40tshk54dtl7fov2s/vimowivipowalom.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa2191295a6---51138200402.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/56611755117.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021051612095335.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_off00011446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11446 18232 bytes
SHA-256: d5351f235a95ca859cd1ea7aab8bf882abec1b56286635778054a02dc859ebd5
font_01_sfnt_off000143e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E4 11140 bytes
SHA-256: cd0f49cdfefa72d43b11f78e6276441363498cc90ef49607972334a62e1d00e0
font_02_sfnt_off00015dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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