Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8730cbbcbc7a797…

MALICIOUS

PDF

98.3 KB Created: 2021-07-30 02:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 001b1e18511e39cae29ab00055fa980a SHA-1: 337f5071200eec532dad0ff70de2b49b4d540e0c SHA-256: b8730cbbcbc7a797b5095df7c3badc8cf7e5dc94d7d438b5fd5bdb3aadbb3d70
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, as indicated by the 'SE_CALLBACK_LURE' heuristic and numerous embedded URLs pointing to compromised websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or facilitate further compromise. No scripts were extracted, but the document's structure and embedded links are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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) or Microsoft license-boilerplate 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://medvor.ru/uplcv?utm_term=nestle+dolce+gusto+troubleshooting PDF link annotation
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/aeda81d7e3359f5ce14a317294ce10f0/mijugadelut.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/24f4a9e04d1cc3d428b223c8c11d9392/10651151790.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b657c3f4202---javufowa.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/92326442567.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/tijalorelotesenezepapa.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd1756eb75---lizoruw.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6703ac80d9---mulifebexibubuwuga.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/ce6a3945ccb02822ceb234b1e3294b2a/tutilowisopesorexakuwupu.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160804e07b182b---36964655252.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/23577001400.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/80d8ac75b1e32b8d02dc7dc19387e73b/mezewerazabas.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/jovezife.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/1egjdfrsk7ka3f3ncb9js7fkq4/29774257858.pdfIn PDF document text
    • https://landi-bg.com/images/file/91155768991.pdfIn PDF document text
    • http://congtyvima.com/images/Download/jisakomajupu.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1621407990.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/girotituwafo.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/vu1fv36ggll95n58o3cibnrhqj/daduwoxivusojowurobiv.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/52752f406a7d5a5149a38e088ee76584/42195847738.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/dozipinu.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f93196aba---67486765821.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a4dd84b54---25773949920.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160bef37a51b26---pozenuvowa.pdfIn PDF document text
    • https://clubsportedinburgh.org/userfiles/files/motalunedatisof.pdfIn PDF document text
    • http://tingyi-bnb.com/CKEdit/upload/files/12895810480.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_off00011865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11865 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13077 18336 bytes
SHA-256: 35f308b04437ecb1711365befce32608a1d26c0432c388014bc82eac6cb019dc
font_02_sfnt_off00016086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16086 10704 bytes
SHA-256: 86f2ee6e2cf7bc3256d369b821046c4abbcc9cbea0dd22ac52f42b56413dbfe8

Open this report in the interactive analyzer, or submit your own file for analysis.