Malicious PDF — malware analysis report

Static analysis result for SHA-256 119a3d9fca4bfaaf…

MALICIOUS

PDF

86.0 KB Created: 2021-09-02 23:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1a07638ad44c57dafff0408b2ee6e7ca SHA-1: 33b546598c1849ba9a25c5542409c5437225c9db SHA-256: 119a3d9fca4bfaafcea4a563bad9aedb21417709ec75f8462656348e66c31fa5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to other PDFs hosted on compromised websites or disposable domains, indicating a link farm for SEO manipulation or malware distribution. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of external URIs and link farms suggests an attempt to lure users to malicious sites or to improve search engine rankings for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/b7cbc03043d5576952609b05043974d8/8793487645.pdf In PDF document text
    • http://ipmarketing.net/userfiles/file/dozexasudisuvorexigilele.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/94133948195.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/vcmaulc8qtla78pk9n7ngm8jq9/baronarezovokesafan.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/54283509449.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/sisowumenozod.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/74786290990.pdfIn PDF document text
    • http://shahgrp.com/uploads/77759707839.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/foris.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/4c95d94e3a768f3532ce4ab682a79380/20381608396.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/41140158747.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9dd058d0e---valip.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1612d61854441c---xumoxo.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/1428367851347ba8c2ccbafad4c304b3/tobimo.pdfIn PDF document text
    • https://windsbs.biz/files/file/kubaku.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/759bc26de657adc8af99a87838dd176e/sexugipalidenujakevufami.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abffd904077---87289021242.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/0ceb5707cdf9031ad0119f759d1d5195/belolevekudu.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/57568663611.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/kuwunepinaremisolewavaga.pdfIn PDF document text
    • http://aiken7050.com/clients/5/51/510ae66c864a6d23552e02d1b5190e2c/File/45650642163.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ac743eaa4d6---nazusafexozu.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/6d3bd1a65db7ad8fd2dc7706298aee35/79029071087.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/xedarofegarasopofegowekut.pdfIn PDF document text
    • http://rowsontw.com/shopadmin/upload/files/9457289353.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/tinewagazejiniwokati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=greek+and+roman+mythology+what+is+a+myth+worksheet+answersPDF 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_off0000e9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B9 18260 bytes
SHA-256: 6161835b0656541d0e34831bfe6b9fe46d88857a0860278d72ad7014b9abbe71
font_01_sfnt_off00011866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11866 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001307d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1307D 11024 bytes
SHA-256: a6794602fd15fb993bf3cdd84523d59c89d3a04a26c525f4f0a0307b124b58f2

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