Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ef9492eb7b17c9…

MALICIOUS

PDF

85.1 KB Created: 2021-09-19 09:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4cb5aed644b51a83b6c2f767c85732a9 SHA-1: 8dcab483459b33550adb7c1d79cfec8fc8dc7155 SHA-256: 38ef9492eb7b17c9e4829b4041ab19363561e62de87ccc681967901dc08ba35c
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on potentially compromised CMS platforms. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

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 http://fitsiluet.cz/data/file/xupipiwu.pdf In PDF document text
    • http://orenprom.com/img/account/file/jogomajelofagifunixipi.pdfIn PDF document text
    • http://ecole.ru/text/images/file/xumizokul.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/58724490861.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/pibumuduzewip.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/nivubalet.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/76534139480.pdfIn PDF document text
    • http://contextuae.com/resimler/files/vazaribefafifikuponolage.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614674b5d90f5---21439798606.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/jefusowigurujidadusexawu.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161327b868ea05---kigerum.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/97824547364.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/14024939970.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210914163552.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/98630336628.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/71426699749.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/12879236400.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/daxekokawakutevig.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16132910eb91e1---67070063483.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/zubaliper.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/zizisobekewakorejali.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/tlp2be66m8ji3bpl9o9tgo72ar/40476364816.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/xatifatef.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/33925904957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=free+youtube+subscribers+mod+apkPDF 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_off0000e796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE796 10948 bytes
SHA-256: f59aa7a01810920edf37552e60602f1dc7d50156261dd30796b48680e1f5b47b
font_01_sfnt_off000100d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D7 17908 bytes
SHA-256: db0bc1be5231a5806d2c9503470f47328c4188d7bb43264817fa2bb66c091920
font_02_sfnt_off00012eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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