Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9da6b8f245e810d…

MALICIOUS

PDF

95.6 KB Created: 2021-07-16 14:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2b5aa742b6f5e99dd414942f14a2d02c SHA-1: b716c7b8aa11abf9d77bfc6082cfaa4ddf5b0c7a SHA-256: d9da6b8f245e810df2944eba8fb6565da8baba6b31e38fbc1756459df2d3c2f7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many of which point to compromised WordPress sites and disposable hosting, indicating a likely attempt to distribute malicious content or conduct phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, classifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure itself is used to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 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 https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/78c8ecb1f9043ae9b62fa830c76d70f7/7667545573.pdf In PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072aedd68004---48272925657.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/qmqn6sl1cd7v8sru80nbchnh8c/8301020174.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ef90a7cef1e3fa5265a35f9013f71c8d/papolevirawijiwulafiwu.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/c1301f78770331e34238cc221477486f/95778929527.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/57826682376.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/me9kvfn99fnefmrfd5lurglgbi/kamufobamivibofala.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076961930915---befimabobozetoxeruwal.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/eb3497ffaf39c1534817ab84cc4c1d53/gokexanipokapexivunoki.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/e701928872b35ffb0240348e68e90c18/jitazituwi.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/regugune.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160de5b30198e2---14252429843.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16083d120761de---vorigotifisunisenararut.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/c46c3c54fcc3e2657ecf108aa4e8f23c/siduno.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/2173785549.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c688e477da---dexodu.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/4qtjb1n068c1csb6q1q08llec9/65343678593.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/falodidanurododunofug.pdfIn PDF document text
    • http://mertlakustika.cz/images/pages/file/54967458707.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/jsp7a4394556mnl3nnivs201m1/buxumexomewomikosuxid.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/96757791668.pdfIn PDF document text
    • http://lighthouseofworship.com/clients/44803/File/bovexisi.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/14845599828.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfc66a113b---13497078850.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/2fe5b3a196f812b61959b80ff400bd33/91604990530.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/18074649448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=writing+a+philosophyPDF 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_off0001117a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117A 10504 bytes
SHA-256: eb9393eac7f10ac54541c6c624c2de3bff27ccf8e87be5055131a975a1fb0168
font_01_sfnt_off00012949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12949 18188 bytes
SHA-256: 1de747e0ff9580c77dcf5536efd6900b9c0ab722669952ba96e46fda3ebf42f5
font_02_sfnt_off00015956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15956 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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