Malicious PDF — malware analysis report

Static analysis result for SHA-256 9db376f45917913f…

MALICIOUS

PDF

88.0 KB Created: 2021-07-23 06:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 86b97bb96a08f6e556b8e5d3beffc851 SHA-1: ff6703e2b4881fa8c0fa185f1bd6cc8754266400 SHA-256: 9db376f45917913fc31026fa2ddd45ae04efab20020a4cb17ef4efebc1d04228
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malware or conduct phishing. The presence of embedded URLs and the PDF structure strongly suggest an attempt to redirect users to malicious content, likely via a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8eb0c52eb---68885414507.pdf In PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/u4842mqqoasl2s91i1kvels0k2/zexudowitalafuvoweke.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/31173270900.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b199dedd584---pikupo.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c264330577a---xadirapezitisemurijeto.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a03d7f02c7---didusatitibokenawigoxabi.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f913c5f62---65707161536.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/zodasewezunamevepuz.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/2595c1aac345f2dfaa9b51913329c6f3/4066084633.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/7938737097.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/0f25a9a3df62b80d440d6fc2e18028f7/62708576254.pdfIn PDF document text
    • http://gyorszol.hu/userfiles/file/81888320899.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/7aee4b1eb8088cfc5d10e5c659f0a1cd/92931139019.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/78528404437.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/c9687d6801fb4ea32914339d29c30f4c/firivafeni.pdfIn PDF document text
    • http://twxcd.com/img-aim/files/73254331480.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/60130939665.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/5tmn0nhokk2qkqjto6n2qio0h7/66360713344.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/87419977762.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021062335619_285963077.pdfIn PDF document text
    • https://latework.cz/soubory/70798145202.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/n8i8jp7vrfbg88ptdrsqdko1ki/keremefutiwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=modernism+in+waiting+for+godotPDF 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_off0000f3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE8 16672 bytes
SHA-256: 1456e3a653490469fe74c287476bf0451d311f3eca970ba5559849b4d2fb566c
font_02_sfnt_off0001371c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1371C 10732 bytes
SHA-256: 44ff4bef20458b42047a9ecb62516c8bd75b5d95ea9a5d47197daab9068b5a73

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