Malicious PDF — malware analysis report

Static analysis result for SHA-256 be5fe0d7253c8329…

MALICIOUS

PDF

73.2 KB Created: 2021-10-02 22:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 43cc0829dab55750b320593e4aa71b65 SHA-1: 97ef6dcefc042a2b45f761773a0de1a32532b03d SHA-256: be5fe0d7253c8329f52f83b6230ec7d03443b239402b077734c279871b7d3ad2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm pointing to multiple domains, including compromised CMS uploads and disposable hosting, which is a common lure for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary goal appears to be directing users to download files from these suspicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/zuwerakaxerodofofejurerow.pdf In PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1615816711c92a---lopuko.pdfIn PDF document text
    • https://thehouseproduction.net/file/rigafexisapunapajilivileb.pdfIn PDF document text
    • http://kccmaul.com/files/files/notewasexepejusugat.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/17373766567.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/10695016497.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/41140939227.pdfIn PDF document text
    • http://sin-hua.org/userfiles/54573269452.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16134163c1d2fb---90524577215.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/75189112012.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/bb1f1cafb6dd7b55f3ee462553fda5ea/5828759544.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/buwoken.pdfIn PDF document text
    • http://yoron.net/up/files/xumugunegirobelules.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/jewesunelutaremepimeno.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/wakafufuxob.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/28307932778.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/30262595816.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109031149005196.pdfIn PDF document text
    • http://xsteelstock.com/d/files/75156819841.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/47587596154.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/34d60855a2c5cc4adb1ba38e4cc4f270/11772617789.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/dolixitanulafot.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/wugutorin.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/84544687477.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=a+thousand+years+free+mp3+downloadPDF 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_off0000b4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFB 18672 bytes
SHA-256: dc4c3c52d0fc13e870e0b95fb40be1109cc8d7412222fecf2cf200c4ad01d10a
font_02_sfnt_off0000fd31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD31 11124 bytes
SHA-256: 9adceab463f50c2245ea37b910b6454a3516f88c6ed7d97a68b1cfa169749c60