Malicious PDF — malware analysis report

Static analysis result for SHA-256 e43ea1e95b804276…

MALICIOUS

PDF

82.7 KB Created: 2021-09-14 12:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f3877a3a2974f4dc940957125cc29801 SHA-1: 1c7f1c375272a7831aa9cf2d9dd46920b1ce9087 SHA-256: e43ea1e95b80427699ad96fab4d1eacefdc10408cb1e2fcb67a3b47f4cb15a90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The presence of embedded URLs and the overall structure suggest an attempt to exploit users by directing them to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://manpowernepal.net/ckfinder/userfiles/files/sebenimuta.pdf In PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46341464302.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/20202341975.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/sawukikowuwu.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1f06e4f00---54752375352.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/gebinike.pdfIn PDF document text
    • http://azizolace.cz/images/file/merediropenopuvimonufogir.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/20922721502.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/1f4fce0e2f27350c903f8eb29902922b/69803658252.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308acf9f233---parevefesakemi.pdfIn PDF document text
    • https://majubesar.info/contents/files/92770337272.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/narobuzilewugavixomivujo.pdfIn PDF document text
    • http://mega.kz/media/upload/files/pemosawepizesu.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/70465379625.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/38330057523.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/sumuvuwipej.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/kulop.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/xidunuvegabatigemileli.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/56032924909.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/kagupevexujir.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/zunorezuxuw.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/4877348338.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16136f14c6b851---ruvit.pdfIn PDF document text
    • https://posh.hr/files/genalo.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/39264354280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+transfer+sms+messages+from+android+to+iphonePDF 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_off0000ddf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF1 17672 bytes
SHA-256: 6139d45f5110aac4f7bc88d3a777a0cf1007815bdef896b716615bec6a09800c
font_01_sfnt_off00010b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7A 10976 bytes
SHA-256: 293c424a47de4312bed48b72636d7b5ee99643fd8fdb8e92ae2d0772fa18e166
font_02_sfnt_off00012499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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