Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a53347a58584fbf…

MALICIOUS

PDF

95.0 KB Created: 2021-08-10 21:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 652e6a838b9901fdc7a9ba7884c6fc44 SHA-1: 4680dc44ef9b87ed5857285a537dadbd5d96111d SHA-256: 8a53347a58584fbf93a526c6da4322002011f4a25b687b7a6d99c6a62205baa3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links to external websites, many of which appear to be compromised WordPress uploads or disposable hosting, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://infrive.ru/uplcv?utm_term=fiche+technique+bmw+r80rt+1986 PDF link annotation
    • http://5lovestartw.com/CKEdit/upload/files/xadewabopokiga.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/b21b2313c949f12731cc4a16d05c8cad/29516786951.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/47847544382.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/mudaredasawugefidijebegoj.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/81184b99b65e4614fd76c967ae7b6ad7/77746795360.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/josalaguvinakusifuvaw.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/e5a1ca702b023b9852950361fd703639/zesuzezadopawanuxew.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/cipbi68seme6iqr6u2v864aum2/kujirawozix.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/gatakasigejore.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/rebumuwo.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16071aecfe850d---27506041873.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/88060919854.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/8798782197.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210718170144378.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb7467a572---jiwegatad.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/n3fivq0vvfbepcg33faaocggjf/damux.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/nbg7dm1uqibsk6ilrt6bt34han/gadilakawupam.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/aac9464e532fba4b301b22f4af3f79fd/83296699968.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/75877109677.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/899b8262ddb241f883d438e04715bd47/zuvozet.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/6d323aaa6a9fe204c19948db83c634cc/jisosuzuxopuveg.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/96630091762.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/4480af41341069114664b9860aa4f182/44386614982.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5c74c971a---16885044669.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/morotadida.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/guzevufebereka.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_off000107c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C1 19176 bytes
SHA-256: 273f4d335cd28398853806f1143ff629d08ee33bba6708617c2cd6e216e93eeb
font_01_sfnt_off0001394b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1394B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15162 11168 bytes
SHA-256: e7ad37778e88e81a00f2e193bb5cc997a818e22973b1f0483dd0633731aa3ba3

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