Malicious PDF — malware analysis report

Static analysis result for SHA-256 71af1b98de9ea3f9…

MALICIOUS

PDF

84.6 KB Created: 2021-08-20 10:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0be1d0383f0c834c1adc763cab714668 SHA-1: 6ea81470d8ea22c0e28e9a1454e37c43112044cd SHA-256: 71af1b98de9ea3f9905fa3d880e36e0f9b9717be2668dcd53d1ec6b3a2425033
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting sites, which in turn host more PDFs. This suggests a multi-stage attack aimed at distributing further malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://sooclose.eu/upload/File/zekorugilovaxezugivip.pdf In PDF document text
    • http://kzlo.pl/fotki/fotki/file/4048265588.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161059ba5ebdff---85349957649.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/lekevumoba.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/topejiwibilezax.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/84647537109.pdfIn PDF document text
    • http://janandpoos.com/clients/872640/File/kuzukugexarazode.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/kejosebemifuzi.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/fepitufiwevimelovafezenut.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/84078103665.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/dogejuxinogom.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/eckub4ldpoccj90ujkf2c3kqj1/zapixamapizudubizasup.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/98211819669.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d72ec1913b9---74146286332.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160819e12487d0---29701813473.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/34284703962.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/9dfc39e7e3f7bf5e8852bdfd6f6a212e/88388940346.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/wolorisetofitamaf.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c1a56f7d8---lowujupedoxakepawizidovet.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/29588459752.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/29757329019.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160874361a29a3---leref.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=tokyo+ghoul+season+1+opening+song+mp3PDF link annotation
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA51 18880 bytes
SHA-256: b68565f943e569d181d3f546c07164e3e8b543f717d91b5a3156e2a593a56246
font_01_sfnt_off0000d890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD890 2464 bytes
SHA-256: 410218f2f306486d15dd150a9242cbc2d1a6664d5014a6e7112e78496bb0ae3c
font_02_sfnt_off0000e33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33C 17316 bytes
SHA-256: 371e657a2fbfbef574f289ce80b21fb3201da63ec912e072213ba4a33af1c2c3
font_03_sfnt_off000110b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000128c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C8 10992 bytes
SHA-256: 1d529ab1e31d32e121e7afa640bdb40ca8c8772128944681f3c78230b5bbeab8

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