Malicious PDF — malware analysis report

Static analysis result for SHA-256 366e2778d5865706…

MALICIOUS

PDF

76.8 KB Created: 2021-09-12 04:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 309eb6db402d07e9d084e9424032cee2 SHA-1: 3326d20548e0389046272aedc03187341ec0f420 SHA-256: 366e2778d5865706bfd40215c50b840500d503dd787c8a97705eb7a9e9bb5054
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised CMS upload storage locations and disposable hosting sites. While no scripts were directly extracted, the nature of the links suggests it is designed to lure users to phishing or malware-hosting pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://siliconautomation.com/userfiles/file/jowovepikaxunebav.pdf In PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/90934183888.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133e10514ecc---biniguxotimofajupojumerap.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/bukasujamigekawuzuj.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/wirojuvadutazegoje.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/modikotelusajitimid.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/zatowesusizuwu.pdfIn PDF document text
    • http://amirmazandaranihospital.com/ckeditor/files/files/45573025502.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/27000215278.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/wuxumivi.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/29718389515.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/96437381507.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/26102511853.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/13012953641.pdfIn PDF document text
    • http://mp-journal.com/media/file/19616653238.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/56916913843.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/watilunopanusopomenoxe.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/86095863976.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134efee76d50---53034233865.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/5664079899.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/23c6f4798e7550ee83d13cf4768ffc63/xamusegosaxojulegobemiw.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/demamagesuzitupadipuko.pdfIn PDF document text
    • http://atsolution.org/userfiles/file/20210911031522987997437.pdfIn PDF document text
    • http://cochemical.com/upload/files/14819472305.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=skyrim+lost+legendsPDF 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_off0000c9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C5 16840 bytes
SHA-256: a5805cd8fcc24637316bbaf7b0ee2cdd5f6eee8944de0427a4bcc87112f43c5a
font_01_sfnt_off0000f528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF528 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3F 10712 bytes
SHA-256: 159e8b506916c6f4a3f50f490101c1cdc44d1fd5a19f8e5d2047637e01083057