Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ce3b2093791ba87…

MALICIOUS

PDF

71.9 KB Created: 2021-09-18 10:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6b9c216de6321e7765b3ba61f5b57687 SHA-1: bb24c6a0345c7ecee11f838f72a963816ee2331e SHA-256: 3ce3b2093791ba87d0874bb229d127e4b6664bdd70225252f9e4dd4a4d5621b1
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URIs, many of which point to potentially compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of external URIs and a link farm heuristic points towards an attempt to exploit user trust to visit malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://plechotice.sk/tmp/file/3062747006.pdf In PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-14/20210914120408197508.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/75095319205.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/nokijakezexumebavo.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/96934538270.pdfIn PDF document text
    • http://agavietnam.com/img/files/vemonejenosotutexar.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16133b56ea84ea---jovajajiweke.pdfIn PDF document text
    • https://inks.bg/userfiles/file/sibaguwutexeleburulut.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613557f26cfb6---24407250390.pdfIn PDF document text
    • http://pololanna.com/user_img/files/renob.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/xogikizawajumuzekepi.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/20999287588.pdfIn PDF document text
    • https://citronel.com/userfiles/files/4765150039.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/26107dcc08f4dd622a257c513e10338d/pakiserimetanujaniwa.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/zapadamozolawolixarurik.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/226e705bf04004e7a121b0a0d3c5365b/siwezasogu.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/26621838497.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090922524373499.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613931b0b5d27---fesuw.pdfPDF link annotation
    • http://guojingmall.com/userfiles/file///8629035362.pdfIn PDF document text
    • https://btegypt.com/file/99591315290.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/86722803996.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/j9q228d64l6ds3ofi6em398m21/64265659096.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/91970991270.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=ice+age+3+streamingPDF 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_off0000b751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB751 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF63 16828 bytes
SHA-256: 9d7616300ed87bb7cb61b4fd0778f9c3df5de6ca5a7a1e9c9093674a710425ed
font_02_sfnt_off0000fa44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA44 10532 bytes
SHA-256: e065fbffb60ec2edcaa4bfdfeca46875114bab9c49d59a25c5c510ae76ffe5e4