Malicious PDF — malware analysis report

Static analysis result for SHA-256 0679033a8ea470ef…

MALICIOUS

PDF

81.2 KB Created: 2021-09-04 12:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dc7d6cf9005be095630539419ec6ae83 SHA-1: 9da27d9662d6a2f3cd0415591290313d6e31d7b5 SHA-256: 0679033a8ea470ef3e85a425a4cbd4dade808741bdcfdb90c64fc301cd1c44db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous external URIs and link farms pointing to potentially compromised websites, suggesting an intent to redirect users to malicious content. The presence of multiple PDF link farm rules indicates a deliberate effort to obscure the final destination or distribute various malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://crewmak.ru/uplcv?utm_term=editor+pdf+gratis+windows+xp PDF link annotation
    • http://canphantich.net/Images_upload/files/wamavutatuvanaxawirizer.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/283678024.pdfIn PDF document text
    • http://www.minaakshimajumdar.com/fckimages/file/jajetobebadigazejisav.pdfIn PDF document text
    • https://shibbirs.com/media/files/77911107074.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/aa3cda45d780e1d5ca0f8861218b872a/simufarisezurujumo.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/kusuvuke.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210620065947_o4ylhm.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/73233323279.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/sozuju.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a3466064ad2---29174090868.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160ec96f6daeb6---nujajuxofabusosusamelul.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/bowijulope.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/gire5k6of5eii57vpmei9eam1f/jafaza.pdfIn PDF document text
    • https://maviet.vn/upload/files/defozogopagotizini.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160824b7d60510---vuwegadolugisovedegi.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed87ce38bf---wikawuxidavulamuken.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/birivekatapoxezifokedi.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607920c9e472d---17200462291.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/c1c9051ce2bd02324a05d8805c892905/70696291867.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/82155960738.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/4acf63dc79b6dc9b3fdec5ea1c0777b5/53142561047.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/wipemuwuk.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/larafojivenasefobofu.pdfIn PDF document text
    • http://fotossc.pl/_files/file/41128860912.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/45902469309.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/sirigadu.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_off0000d807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD807 18692 bytes
SHA-256: f57a79d590ecfe011642ca61e86bbf837750d01998fb8fa61c8d5acb47d29dfd
font_01_sfnt_off000106bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED2 10668 bytes
SHA-256: 34fc3f2b31e94333175b6f66368512dcfbaae32c4f00ba0be451f3fd8e45135d

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