Malicious PDF — malware analysis report

Static analysis result for SHA-256 e88ea2992f0acf53…

MALICIOUS

PDF

78.5 KB Created: 2021-09-11 04:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5022de43af2cecaf5ebeba63132a4aae SHA-1: 93eea6645c87a70160e7eefb3d58b720d4e7dbfc SHA-256: e88ea2992f0acf53f2cea01194c36fbe8491892fdc8c0c03a37b26233cf4b1f4
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a focus on search engine optimization for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://hiredriver.com/uploads/assets/files/58873728453.pdf In PDF document text
    • http://progetec.org/userfiles/files/lukesetejoluse.pdfIn PDF document text
    • https://drlanda.hu/user/file/19439051407.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/40877748740.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/raminupofepaxigan.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/wofixusa.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161320fb10d059---71851012759.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/ff75b85704f77816e3fa05cba3897b0b/68970743616.pdfIn PDF document text
    • https://webdatedepot.com/userfiles/file/wuvaxujejonalog.pdfIn PDF document text
    • http://mrybalko.ru/files/3726095005.pdfIn PDF document text
    • http://shriramashramps.org/userfiles/file/pexaniboxok.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/42247376933.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/rusivi.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/givaserolikevidorepi.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8e139c3cb---61659624287.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/22193778357.pdfIn PDF document text
    • https://norservis.com/files/files/megawoterevikepumomutuvan.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/bavirebadesavu.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/nifawolejasegive.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/15523710329.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/19827604151.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/segakonewan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=goat+simulator+payday+free+download+android+apkPDF 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_off0000cf49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF49 11092 bytes
SHA-256: 06d420bb54464d9ea4d83610858dfc012bef6771371a319106431e9e090563c2
font_01_sfnt_off0000e940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE940 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10152 16812 bytes
SHA-256: 618e34442bb85c09f52413c524aeeab15ad01007bfa600cdf310f6ac6c9008d4