Malicious PDF — malware analysis report

Static analysis result for SHA-256 40d8510031d496ce…

MALICIOUS

PDF

78.9 KB Created: 2021-07-29 12:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7232c0792b3a52b902a68237ce0ca28c SHA-1: e06d710df1c6021c7304485354d6828a1b6dc649 SHA-256: 40d8510031d496ce871b997eccb59667d3580d27eff6a6c9f3591783ce772459
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous URLs, many of which point to compromised WordPress sites acting as hosting for further PDF documents. The primary function appears to be a link farm designed to redirect users to potentially malicious content, leveraging compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/9b4htd9otcmnp75nefu92r53f2/tidajaxebupovawo.pdf In PDF document text
    • http://cp-1.ru/userfiles/files/38591385202.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fb632990a01---27383738250.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/kckvbolpg676tri0j1ru2i2q9d/mopakopezigojalopuda.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/12jk5ea8u4br5rmbhm6o7l5vu7/wifalinuguwig.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/sapusafetul.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/50778533596.pdfIn PDF document text
    • http://drtamerturan.com/file/gulupipaxarivukefeka.pdfIn PDF document text
    • http://alohasafaris.com/files/wikusakinu.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f33807b887e---44720296435.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/zizapobuwoz.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/10307856826.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/0fb039f4ff8e7f7ca74d20cfa387591f/bofelelirepobegotena.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/terijinekisafiwidowix.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/000e8904fd6efe5d63458ca4c3d9cce4/141123907.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/juwomemavixeruzusovameg.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/21734052456.pdfIn PDF document text
    • http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/85578339025.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/5d2e99301b6c25c1a7fe3dc23d12cc66/banivovizadawi.pdfIn PDF document text
    • http://stagnesreunion.com/clients/e/ed/ed16748122b3ff8ec97113314e0446c4/File/kewipilaverufuwasewekogo.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607a64d9b7c45---27526064217.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/zodurewenexix.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfd9637649---65959466452.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c8556da3a---362082943.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=palme+yks+biyoloji+soru+bankas%C4%B1+b+pdf+indirPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB825 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_01_sfnt_off0000cda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA5 11184 bytes
SHA-256: 57f40821e078e44708d6fb17ba77da117c54c00b6e1ee60a916bbfeb11fc1560
font_02_sfnt_off0000e776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE776 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0000ff88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF88 17944 bytes
SHA-256: b00ce300f6fc5e8eae9fb5932796c52fafb66bee234cf48f4e32c0379cce570b

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