Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9826f94e0d7448c…

MALICIOUS

PDF

86.9 KB Created: 2021-09-11 13:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cd58f7a753199b4e3b03e604c4f4da93 SHA-1: 09378c59e51c45d0a3004572fd6ccc0dfa634a9d SHA-256: d9826f94e0d7448c4d2998cf43c63bb8ba6d0d19243a9400f925dc858b2f988e
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 disposable hosting or compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is unreadable binary data, offering no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://elitstroycraft.ru/source/file/zoxoxisevidomokifowoje.pdf In PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/27151618576.pdfIn PDF document text
    • https://biomisszio.hu/tmp/tesowakibukuj.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/84530360264.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/tekidevujafidas.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/mewida.pdfIn PDF document text
    • http://geasit.it/userfiles/files/86241640519.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6707ec89e---96347652600.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/30586445474.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/38701597470.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/3c2b2c6e0f3a38a0ab6153fa80591e18/88182977582.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/32930051632.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/vonemurepotowolokor.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efd1e7bdcf---59575399055.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/10807996803.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/sedupebono.pdfIn PDF document text
    • http://domario.ru/userfiles/file/powabusaruzobejamila.pdfIn PDF document text
    • http://integrotech.pl/zdjecia/file/gidafunewafidupi.pdfIn PDF document text
    • http://yilip.net/userData/board/file/15186712902.pdfIn PDF document text
    • http://neteyes.eu/editor_up/78466856011.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/92310750417.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/dagiw.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/kaliv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=the+nanny+season+2+putlockerPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/57174900953.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC38 10768 bytes
SHA-256: c3b0db24ceaabb1931aea4d444348b406be5e25a85287a0e1dc65c3fd19d72c8
font_02_sfnt_off0001051d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051D 17976 bytes
SHA-256: 6b032195f6caa91ac80f0f0404e0a07748ad1d67ff19f21f5b31e8bdc0f41484
font_03_sfnt_off000133e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E8 17268 bytes
SHA-256: 7912c89ebbf54678e8f5c7c1d0220f297d90ac373931578dba8573c3e68b8b36

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