Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1bbe1186f8a1c76…

MALICIOUS

PDF

84.1 KB Created: 2021-07-06 00:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: da0aab76499a56a3af1b2c07e3b5566f SHA-1: 3c3e86bb348ed26aa42ddf5f973cbede3baaff67 SHA-256: d1bbe1186f8a1c7658abdf857cbe6c031dcd71b47022d1df4939d045b09734c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083a514056f0---29764479452.pdf In PDF document text
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/logetil.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/6514958065.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/842ec4b18d14bc4b89bc14903e0a48ff/fedolodipamubabute.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7f3fcdb87---xaselejowedi.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/tarulo.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/zawuxadirexofimuribi.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e33205bc76---nesadedexikesipapirefap.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/jepan.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/39596208709.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/d3b50bfe73ac296a4b0d35fb2b1b198f/47486349794.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/a7c92fac04a5d5573ee8abca7249b718/15761642282.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/48560410087.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9b20bc2bb---kunujotisunodafegizewej.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/dc6daedd052461335ad8f6162b7ec7c6/fuzepibanofa.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/pudemimemodotev.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/8d825ab420470c1b85ea83421fecafe3/nudanulukaxupojuwubiti.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/14574645252.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/775e9e896ec47a03924b57645fe3d884/96608775237.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/xiwuku.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/goledotifibosepunuxu.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/52088445976.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ae998944f---xatunu.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/287f4f752e0dd350a5617cc7be67f9ca/52516145012.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/jerimekam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=south+american+frogPDF 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_off0000e700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE700 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF17 10744 bytes
SHA-256: 0e35f28905d11dc36139433d09bc51815eceb5840ff05abec93ab7459ee4b455
font_02_sfnt_off000117a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A4 16884 bytes
SHA-256: e6f8b80d553efc242e08f5a7ca25836c1138e5f2de926d0d68276fc6fea87ba6

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