Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac87417075be09c…

MALICIOUS

PDF

85.7 KB Created: 2021-08-14 11:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b5c5ce3c30a1e465a29fb23acbcaaf59 SHA-1: c78d3f040f887742ee58f0376d5f8fbb7334990d SHA-256: 8ac87417075be09c7fd42e19c85f7aa232452024e33ca31469a68ddca9ea3942
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of multiple links pointing to compromised CMS upload directories and disposable hosting, coupled with the 'link farm' heuristic, strongly suggests a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection or download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b414363d3---19505441935.pdf In PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608154cc756df---jukivivexomigoduw.pdfIn PDF document text
    • https://htapigroup3.com/contents//files/riwenejazilew.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/43520095584.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f3c0984a1---dagonoduponadir.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160eca3006b5a0---75769321739.pdfIn PDF document text
    • http://ypdtools.com/ckfinder/images_store/files/rurudusaj.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/14975205424.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/nebebufirufozora.pdfIn PDF document text
    • http://519pf.com/userfiles/files/pipewifujud.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/53668583458.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/tokesoxalizujuvuwugapof.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/1322324886.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/7f1ddd957740540675e0e49880143db3/64693330317.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/eb9aa3aec97a4c6dc36cd21c211b3016/94306992321.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/104712d44509aafcfdc1af6f98cc1eb5/76602618568.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083321580769---2847401790.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/nbsrh1t4opr9l6tbc7krr53u64/nujigapekixojol.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/8b6ef9eb4271e99df402558ad45beb3e/37691219505.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/aea5cefe42354723b2c0695bae8ab26c/wirukirawaze.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/dawodupusitegowekaxuxo.pdfIn PDF document text
    • https://ebdaatcoop.com/userfiles/files/53495604442.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/garujevovexomazi.pdfIn PDF document text
    • https://iwistw.com/upload/files/19734573998.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2bacbc5d---berosepago.pdfIn PDF document text
    • http://tinybit.cc/bf4be538In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=hacks+for+1v1.lol+pcPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D7 16544 bytes
SHA-256: 66b7945b99a9c78025a9a0ace4161995b24b08b80ea391fd428eddc3553bac27
font_01_sfnt_off0000eb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB96 17392 bytes
SHA-256: 2081ec7c56d0514ba99ab46c0fd32bb6e78e9bcf3f04882d087e1819b9e9a999
font_02_sfnt_off00011947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11947 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001315e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315E 10312 bytes
SHA-256: 4ae50d7c0189aa3e3465e3aecf5670737aa4d5cbc931eaf888564d5639f16446

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