Malicious PDF — malware analysis report

Static analysis result for SHA-256 75b82bf58c288fba…

MALICIOUS

PDF

82.4 KB Created: 2021-09-22 10:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c9a5ce486b833f322c9fff9a708734d1 SHA-1: d4cc97676f58903ab7560785c217e1f7b23500aa SHA-256: 75b82bf58c288fbad4c91f1ca15ee925a365c4dedc147f781b38d0010d9a83ab
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, including a link farm hosted on potentially compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a payload or visiting malicious sites. The presence of embedded JavaScript suggests an attempt to execute code or redirect the user, aligning with a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=how+to+get+more+internal+storage+on+android PDF link annotation
    • http://vuason.vn/upload/files/54435214569.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b41e6f71a4fee67bb0422de01d3c9164/woribifulepofodisezexage.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109172201162979.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/67061924513.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/naradipanonileniwiwigipuv.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/wajowasasusagunezefiz.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/73606780581.pdfIn PDF document text
    • http://scro.ru/pic/file/61005164364.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/fadumimip.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/dovu1fjn4lsin36dnmluf67tl6/siwuvonifebudesapejebov.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/68974672033.pdfIn PDF document text
    • https://fasleh.net/Files/files/41407785116.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/37033838679.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/dakogutefaxiraxefe.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/fefowenepupedon.pdfIn PDF document text
    • https://osakadentalcare.com/contents/files/tutovozasodeva.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/nonesof.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b1ca6507259794a7d56f3a822c1a8f0/41254238886.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/79602480393.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/82743662575.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/limituvejat.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/2078181135.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/batufusijalugosimeme.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090716023373499.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_off0000dd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD33 10668 bytes
SHA-256: f89aede0c02399b2c0a23c97ae98c9319e86b60fc4af7ea02eaebad8fab386c2
font_01_sfnt_off0000f56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D81 17684 bytes
SHA-256: c370de86230226bfab563017b349e54c4efd0063fd617abc9bdfed823bd8d288

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