Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ebadbfae9aeb549…

MALICIOUS

PDF

96.3 KB Created: 2021-09-01 06:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 747d36dcdd6e41b8194db1a992042bcc SHA-1: 539d07b052e8beca26fd7d7810f694787193868a SHA-256: 3ebadbfae9aeb549c424ad7591df6943f69790b6e56a2beb295bca09609d5185
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to potentially compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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 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://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160d029e3c3f08---90842693786.pdf In PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/v8qvk6qdrlg0jqbc0i1g6re2i0/tolupijitebovedipoxo.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f2ba69510f2---18964865419.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210812_FB881700D50C4CBD.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/5283228595.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/51764625226.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/40648592499.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/isf1dfr741a1sujbavitmu2rk0/35597049914.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/4622650379.pdfIn PDF document text
    • https://summit-christian-academy.com/scauserfiles/files/40039427447.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/cc61b585e8c89e39063c45d1f99bd82e/43292790607.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/4e084c143b951d4ec50c4c11092f0cd2/50069999476.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160741bae62f53---82593587590.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/47081004330.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/12bbeb797c21b16e862d305e547e1823/jiwikekowelewi.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/20885582913.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d552c6f15e---34544861538.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/figikunisuvoxilimigom.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/41062065509.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/39407383499.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/f2a1b6f5876997888bc89dd99985a8ac/vitobosasisunonanuxas.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/20290982839.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/87477639767.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c29b211b059---16539208531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=borderlands+3+athenas+red+chestPDF 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_off00011647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E59 17104 bytes
SHA-256: e7c3a687fad9181110a90a6aff1a16b06361c7467dc133ededbec422d71e5f1c
font_02_sfnt_off00015adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ADB 10600 bytes
SHA-256: e40093b382eaff3e67a7bb5ddbf883541d95ba03ef0cfa038a53ca8d6008882d

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