Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfdf94e90de51872…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 13:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 878651e0d2ee5ae4cfb80c86979a6ad2 SHA-1: ba0b9dece6a3b51425c07ef4a18e6d245cb36a1e SHA-256: dfdf94e90de51872ab149bf1a45cfb56fffda903a7de9dabe4b2672579a35aaf
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF document contains numerous external links, many pointing to domains associated with compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of 'utm_term' parameters in some URLs further supports a campaign-like distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://garglob.ru/uplcv?utm_term=vivo+v20+funtouch+os+11 PDF link annotation
    • https://biroestarsa.hu/uploads/file/20496143144.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/18035308434.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/guzinusobawi.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/xilan.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/xunurapopijud.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/39243874064.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-16/20210916025159875275.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/bedusel.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/60784494577.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/66898589023.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/82177087056.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/cnj0uji33361mj2u23dp57eb2r/1373278964.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/folepiderenod.pdfIn PDF document text
    • http://landpas.pl/upload/file/tileviwafozutigejofa.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/simogij.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/73647781403.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/pv3tgdu6tjp4gkbf3jl4643lp4/69206320411.pdfIn PDF document text
    • http://denge.aero/upload/files/lopokeninil.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/94084339646.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/1411033381.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161304369ead8b---labaxulafagidezizimeno.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/76795218192.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_off0000d367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD367 10424 bytes
SHA-256: 73026d9053198149cd420bb5cb53894110caf96d8c3867acb063715d3d3313a9
font_01_sfnt_off0000eb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1E 18480 bytes
SHA-256: 5b7d006969674587a038942d2992828167c0ca60fb50014c89396b8bb36c4863
font_02_sfnt_off00011be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1