Malicious PDF — malware analysis report

Static analysis result for SHA-256 844e8b80421a0001…

MALICIOUS

PDF

85.7 KB Created: 2021-08-04 06:41:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 90a8bab85b55459fe0beec06a9821fe1 SHA-1: 75ee3f6baa36ea3f051b8bd76dfcae8d32578892 SHA-256: 844e8b80421a0001ecf3e180c7c776da1219e71c39779b6769c168faca94fdf1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure indicate an attempt to lure users to malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://pristineleather.com/userfiles/file/dunugadanegadafukaxuwe.pdf In PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/71jskv88b4eqvcc6m72sa6ake3/96027820505.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/jomumetomajeruno.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/sosasiruxizasonikem.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/a60b088813369d6baa1958a178f3f5ed/firizoma.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072645fd7ad3---13696219218.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/58069813949.pdfIn PDF document text
    • http://apple888.vn/luutru/files/mobanarekogisidolijani.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/pirejajofowetapujevokire.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/97585586948.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/volubawiwefeleva.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/nalodiwirojo.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/rufukisivupo.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/zujuximowewirejodi.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/jizexifasugoz.pdfIn PDF document text
    • http://michellesmithscott.com/clients/36670/File/42600886441.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/16544176034.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/86874347395.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/32a706ff7f675778c4159a7edbc6f0f7/niratuvuzarezikan.pdfIn PDF document text
    • http://ahchala.com/img/file/rogij.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/lizazinisofekulikobobibim.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/tinevetexavobuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=coin+master+spin+hack+no+human+verificationPDF 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_off0000eb0a.bin
01f2b766ad5e2503c7e561f3e14382237ac9668db70b147ae616bf1808a84030
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0A 17000 bytes
font_01_sfnt_off000117b8.bin
8bb3ead107bddd7e913a8913b31ff691a317343208607adb4ae04a3aab06abef
pdf-font-stream PDF embedded font (sfnt) at offset 0x117B8 10988 bytes
font_02_sfnt_off0001311d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1311D 16792 bytes