Malicious PDF — malware analysis report

Static analysis result for SHA-256 02d9f13be7050fe9…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 12:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 13815d4b2dc044d9cd0bb5acc3a5a47f SHA-1: 6fd010292465b18257b22937c623a16a31c97a69 SHA-256: 02d9f13be7050fe93098d33c188ea96e280b3be0d0f5cdb97645f4e7892c0c43
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery via these links. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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.
  • 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://queure.ru/uplcv?utm_term=cheat+simcity+buildit+android PDF link annotation
    • http://zrdb-drogbud.pl/Upload/file/gufad.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/64887161462.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/32123629494.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/20654964711.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/gururosaxejul.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/lolugogosa.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/nogomumuvofukekoworopotad.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/99404699702.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/zenolazalumejoteloxag.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/98130383053.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/75383225665.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3ad5513aa---39815116383.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/bubonokulefip.pdfIn PDF document text
    • https://wecareprogram.org/images/file/bavakudozuwivuvifiw.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/46549189516.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ee50d048c---tanigimezezizafenurorigas.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/gemopixapokenitogivabuned.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/94907819660.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/rimowojoxoto.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/ketokup.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/48756299538.pdfIn PDF document text
    • https://akconta.com/uploads/files/sakonosebutilamok.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613508eb221b9---38297343353.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_off0000d4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B3 19484 bytes
SHA-256: 355d1941718c132c09abc6d5cfc93466b0674f45b2ef1a02f0367dfeac80095f
font_01_sfnt_off00010852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10852 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12069 11020 bytes
SHA-256: 75c2e37b667cc163848e0f5119a20a1cf0fd8543ce67ba4df25c73a34379dd07

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