Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4ff9fd68370171…

MALICIOUS

PDF

72.3 KB Created: 2021-09-25 19:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 15ee4acfcb26aa21ff11f94f87fcec7a SHA-1: eea61825de1184105a8c1ca7772ddf12de2b1b23 SHA-256: da4ff9fd68370171b55d576ec558d00c8c6daaa7f366690f6cb7fd0eed62b78d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://allytemp.ru/uplcv?utm_term=enchanted+book+id PDF link annotation
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/d4344372c4e27145752c2786133045b0/ninenepanawuxo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f1372b8d2---binafexaguvitafivovum.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/21933981147.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/51884661241.pdfIn PDF document text
    • http://hidramaco.com/files/files/gamujin.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/kijosiwimewukujotimavagoj.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/47565296107.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/daran.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/zovenufomaxopawowap.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/19270247169.pdfIn PDF document text
    • https://uangraja.com/contents/files/84940271008.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/tesin.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c448e0fac7---purelobowomurenobif.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/zegunus.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/lisinomelut.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/88974125615.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/19502154283.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/57046142489.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161462e008457e---64676015174.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138a500b266e---63354314747.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/zotifizudujifugefuvel.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cbbf329ea---72027009859.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/99547356908.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/51758996281.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/votofamujoguvijonakatutat.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_off0000b3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCD 10368 bytes
SHA-256: da9d745c18aacdafcd8d702d142e9f21749d73097933d2bcaf71cafb7282db0f
font_02_sfnt_off0000e320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE320 18948 bytes
SHA-256: 1ed3806df8c5cddc0e8a504318fafc14f3be11bfb9ea6fe9c47cea299279d557

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