Malicious PDF — malware analysis report

Static analysis result for SHA-256 5345d3d9f3bda220…

MALICIOUS

PDF

93.8 KB Created: 2021-09-16 18:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fe244180422c85e17c94ed32b65341ea SHA-1: 20d703101aaccbe23270f2fce2b242d686d961a7 SHA-256: 5345d3d9f3bda22051bc13c6cd7d5f1c4a16475b115d4b5da263a3e67f8ecb83
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classification strongly suggests maliciousness. The presence of multiple distinct hosts and UTM parameters in URLs points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://inwebjor.ru/uplcv?utm_term=android+grand+strategy PDF link annotation
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613490f12d037---vepuwemugajix.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/90452451937.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/20250712515.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/19947721816.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/83059875032.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/mejofatosiwudiwufigarop.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/66118148473.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/pijajalevebipezazedukim.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/sojuwo.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/mavaxosotu.pdfIn PDF document text
    • https://mangallagn.com/images/file/58102506785.pdfIn PDF document text
    • https://krusomying.com/data/file/xofasuwivinivugiw.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/13519996816.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/1d3f2b1b4827dfc1e3db2a8fe482958f/tigiv.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/sumexenizubojuvo.pdfIn PDF document text
    • http://jx4d.com/userfiles/file/72566339988.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sawezazexibixomuf.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/70285047801.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/givikirogugavosafemekexix.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/51845485279.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133a7b6f0300---moxekepebosawima.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/xiwapikete.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/80095437809.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/44621562838.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/d7c57c41cbe629a5c7b9aab5b8291891/mozus.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wiwofamuriji.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_off00010a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A93 10472 bytes
SHA-256: a5c222e81d0c8b1de6aa6c61523c3c6f96ba79a9271c3342848e668d52b0e5d5
font_01_sfnt_off0001224d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224D 18016 bytes
SHA-256: c8be6955f5612b33cab221d719f9bc99a6c2730290dbc7bb7d23bc78595ccfe6
font_02_sfnt_off00015131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15131 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1