Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ee3fd28e222c98e…

MALICIOUS

PDF

75.4 KB Created: 2021-09-13 01:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b61907a2f83c368dba8ece9989ed5b28 SHA-1: 698be2dfc1e95bf05689100b2de036a3882eed9e SHA-256: 1ee3fd28e222c98e933174415e3d849d8f2a0524dcd405c6f3a786677861420d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pistant.ru/uplcv?utm_term=touchgrind+skate+2+unlock+all+apk PDF link annotation
    • https://palet-school.com/files/files/retok.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090222063273499.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/xamumab.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/2d49afd5dc8393f12f714e6640d9fcd8/vexuwuweguzawijukiseduto.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/tasagegajakefixenerajix.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/waduzegivexivuru.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/sudukunawomotukebuluzin.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ab692df4c---57656412269.pdfIn PDF document text
    • http://bdnchem.com/upload/files/radorusivipunelufikuxeja.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///13759303108.pdfIn PDF document text
    • http://vlajamo.cz/images/file/87565848312.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021091306002624.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109111904243214.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/69214740249.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/nunijumodojevudukexovas.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8911f297a1b3cc5839e53415401b8e34/mesuzelexegulemokizadu.pdfIn PDF document text
    • https://labelmarket.pl/data/file/kepomogexur.pdfIn PDF document text
    • https://fcimoveis.com/imgs/file/safodobamevixofok.pdfIn PDF document text
    • http://z500.si/files/luriwiwilamajukosolemef.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/86181859958.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/vawiwodoje.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/74998380330.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/dusiminesi.pdfIn PDF document text
    • http://bociany.sk/media/file/30219965398.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/47452609125.pdfIn PDF document text
    • 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_off0000c1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DD 17324 bytes
SHA-256: 4ad57a5bf1a14395eb3b8e0a7cbb4c673158c5d18854785fcdc3df78cbc7297d
font_02_sfnt_off0001065b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065B 11068 bytes
SHA-256: fd9b282d2cba03c961b67e56a06f8af94f47200ab2fd4a9d3454ca34e201b87e