Malicious PDF — malware analysis report

Static analysis result for SHA-256 c872f31804813354…

MALICIOUS

PDF

83.7 KB Created: 2021-09-02 21:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ecf1c2f236a4d86166622c2f012ca21e SHA-1: b9cdc0d47fa8670b13a167d975355b64a772766e SHA-256: c872f318048133540fec039c8ea5eefd81f6265921071a55e083e01b512d7eb6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document contains numerous links to external PDFs hosted on compromised CMS upload storage and disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of invoice or payment language further supports a phishing lure, likely intended to trick users into downloading and opening further malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b331771566---sezopexizupuzeruremirisu.pdf In PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/f8ef4dffaa3ff1ad8e841b1faaba0459/kiguzelubutudutofobe.pdfIn PDF document text
    • https://bagstyle.uz/images/file/27951673465.pdfIn PDF document text
    • http://musicupclose.com/clients/f/f7/f7c291dfb329fbc33054893077acf627/File/kasimabulipazofitebotud.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/9407597476.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/4a4813e7c6870c455b7123a3119fa6c0/4850397788.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/tidis.pdfIn PDF document text
    • https://people11people.gr/uploads/File/32141645580.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/88422462443.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/vanikarubaxa.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e92e7e31bc0---kulenumupunolitep.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a67046b920---losimovobunetigekatoja.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fec0965566---85013009313.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/9c8b764db6e3d76f8bb4da13955b0591/28344316365.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/duzosolijonuziget.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/bfeaa115c656576dd971d03492c1a6f6/81406409174.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f7988284c34---25379514672.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/ratuwa.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/b66b3e13d3bc7071d90b08bcbede1196/nitigumugavuzofozel.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a08694a8a09---pifejilojididizozesejiw.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/22777366735.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/0cde53366fe878b10af6589ae9002ac3/41270223527.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/lonul.pdfIn PDF document text
    • https://dhesient.com/media/gidogilenifewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=ews+certificate+form+pdf+odishaPDF 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_off0000e2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF4 10804 bytes
SHA-256: b4417d5b2421068e9ab24c7ebd8d6dd175cd1e28af12e660f5d0c5b047ba86c3
font_02_sfnt_off000113e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E6 17496 bytes
SHA-256: 04d9ca0dff27485bc7d42c0a985cbf68261ee46bf754b01a91711f8ff246f840

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