Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eb52856d8b33e99…

MALICIOUS

PDF

96.7 KB Created: 2021-07-06 00:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6d775dba9fc94462dc91d2aa8638f012 SHA-1: d2b7aa16680891014a0faeba9d05cfc1d97d7181 SHA-256: 1eb52856d8b33e99f12c01f6801daf3e815472c291ee027051407952306ea179
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable domains, suggesting an intent to redirect users to malicious content. The presence of external URIs and link farms on compromised CMS uploads indicates a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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 http://mujuerp.com/uploads/ckeditor/files/20210529092635.pdf In PDF document text
    • http://akcjonariusz.com/UserFiles/file/58358789463.pdfIn PDF document text
    • http://malifer.hu/upload/file/38319917289.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/54121675220.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a670a931fd2---4004048729.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fb8d3c3a3---jusaderafoteputewipunan.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/avemh0hmhe4r4d5hovdueomqe5/17281169405.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/luzoxakavobuwametibuvu.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083c3cc1de2e---tofubenetiwi.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160badef5140b6---44452041838.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/89a70c36c8be8cc9a3374e77920ff19d/47320623831.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/85975389890.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/77928415483.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/noposejefokuzaxekof.pdfIn PDF document text
    • https://premium-house.uz/images/file/nuwizinumixe.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a40e1fc1534---31913948192.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/47967215455.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf07850ca5---xomafevofepuvamuzukemujir.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/99542908330.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp//files/25984588761.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764d61b03b1---junexofigop.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/xubunozasuweg.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aab39da5b61---15870547295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=pirates+ii+stagnetti%27s+revenge+watch+online+freePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CD 10800 bytes
SHA-256: 58ddb80de74c6681d3d7b72754484e5dec45d3af50b1a81f492821eabbe01250
font_01_sfnt_off000111c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C0 18052 bytes
SHA-256: eec16b58404b95510908f9e59d7daf38531a70aa992c7614a83f401178566cdf
font_02_sfnt_off000140e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E7 17384 bytes
SHA-256: 40badf1b290cbf856853f394c00d3a0af654cdd39e7a08023b7f861aa89f0f39
font_03_sfnt_off00015aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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