Malicious PDF — malware analysis report

Static analysis result for SHA-256 332d4cbf66451102…

MALICIOUS

PDF

73.7 KB Created: 2021-09-14 10:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 21288833d798adf6b38ce78223ca51c2 SHA-1: 94516dce5a44d3ac5cc81ea07b02cf9b3ec13dae SHA-256: 332d4cbf66451102d98739f35598a103917ffe48f407d5e3d69bff078492d776
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URIs, many pointing to compromised or disposable hosting, indicating a likely phishing or spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to distributing further malware or conducting phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gaishachuukobuhin.com/js/upload/files/75577148108.pdf In PDF document text
    • https://aqua2go.pl/galeria/file/jurumomov.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6134f0966---97971205308.pdfIn PDF document text
    • http://fourfoods.com/images/files/lufelagiremomin.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/jizovalubugu.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/tudaferolakojabowuzesu.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090700321655.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/dekedoz.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613f58cda04f2---ratalokajadevit.pdfIn PDF document text
    • http://c-amc.com/upload/files/16351236539.pdfIn PDF document text
    • http://skmsm.com/userData/board/file/43875812473.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/davalawukatodawo.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/basarelepoveka.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613efac6e9028---nediw.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/97j8gfu8p51cdgk4rpl78n0k0q/mezateja.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/21623285042.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/gelalanenufozil.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__613F47EF3E9FA.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/xakafegivilipowikij.pdfIn PDF document text
    • http://qwerty.pl/_data/file/pifuvorowabidijapawufun.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/42727884276.pdfIn PDF document text
    • http://kgmda.com/upload/files/divuzumibudix.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/6359510294.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/91774869019.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210913_215114.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/b7004826e7feb6a5e0f8c5037bb57018/69648005055.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/baluzigasege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=az+recorder+no+watermarkPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDA 16028 bytes
SHA-256: 29dff8deefdd8ecc8ca643e68c44c843be3d7e3b04f1312f45ff50a337056b14
font_01_sfnt_off0000e8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FF 10444 bytes
SHA-256: 03a3b4fdf945af32661af64d9a94ae747f6496fa0661204a7caac68a4557539d

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