Malicious PDF — malware analysis report

Static analysis result for SHA-256 d748f897cbcf0e4f…

MALICIOUS

PDF

86.4 KB Created: 2021-09-18 09:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b14758378df38f144c4b6bd9a4c1c020 SHA-1: e7c84af62711f6d34b70172475b7cd4d8913634f SHA-256: d748f897cbcf0e4fee2574f10261e773c1281eaf69938bb80adc3764da8319cf
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=best+app+for+illustration+android PDF link annotation
    • http://nhuaduongnhapkhauaz.org/upload/files/difiguvaxovu.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/dozixowet.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109061029586455.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/3387457f0c3861af7c0b0364e4f91aa3/romodege.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a91430c62---dulorerukaxafovekiba.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/d3876a516757e57710f143e027df2d84/nasutabesorezim.pdfIn PDF document text
    • https://lorus.rs/files/pejebonoluruge.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/16c612c3d8cdb4caed9521e35c3f4308/ridinibozipiwiva.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/xibamuraluzorejutosu.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/gasojaralaguxu.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/40828125689.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/zegiguligorezunobafeju.pdfIn PDF document text
    • http://gachmenminhchien.com/media/ftp/file/mopib.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/sovoputepaxu.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/9012057611.pdfIn PDF document text
    • http://koala-al.com/d/files/66746554701.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/8673725275.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/netotogofutifoj.pdfIn PDF document text
    • https://shinaltd.ru/images/file/28946936824.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/fumuzatowisusomebitubuxek.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/89347d93cd25b9cec7931c582bce3b09/xonajogititesazizi.pdfIn PDF document text
    • https://vendax.ro/files/file/zajirimil.pdfIn PDF document text
    • http://gazetavk.ru/img/file/81608361000.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/wozigusuna.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/wufajijenuzofubiwiromax.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_off0000eeb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D0 10644 bytes
SHA-256: 97345bfd846d88915db335aa3172ff14a7c58bd9cfd533de3a03119dd368a7f9
font_02_sfnt_off00011f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F49 17180 bytes
SHA-256: cf9b36d4461c99fc864fa2cd684e5b756c1b67058a2f032d9b216df5c6ff2d59

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