Malicious PDF — malware analysis report

Static analysis result for SHA-256 d243d760db0a56d3…

MALICIOUS

PDF

82.7 KB Created: 2021-09-01 11:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c3fb422eef64d1fb16c75b705a863d31 SHA-1: fefd50159acf7b4feb6b76a224b110e2c63ebc67 SHA-256: d243d760db0a56d38122b68d84afb3c0818ae0cdcf2736774a948cfe07826034
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to compromised WordPress upload directories, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to further malicious content or downloads. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3b88e7d7b---94499599626.pdf In PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/kezomulirijiwijuge.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/5i2keos1ja4qu1m1fq0341n64m/fulitisax.pdfIn PDF document text
    • https://maturana.cl/upload/file/pezajuxojemixomijunevuj.pdfIn PDF document text
    • http://bscartridge.com/pic/zinuvubipox.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/64570720829.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/b2014178f0af622ee3dd2eade746e66d/bikexexazeriwe.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160987f8849ee3---bijizi.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/komuvijiv.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/75064849216.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/gufasitomenujijusibigese.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/rp89ajfg2sr8o3sc66bdk0ris5/96440067561.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce00100da6b---giluxotikozazopuniz.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34a4718b51---95096610209.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/22843796948.pdfIn PDF document text
    • http://xn--h1aaebbkfib4a.xn--p1ai/sadm_files/xanorolusopiporuzomosit.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0ad3a192c---fodarebutaborixoni.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95175130193.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0b52001b4---vofadavubejedirilategofo.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/ffa2ddf8aa2983cbd0894f544b0f8107/86167008524.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/r9oqre8sgr6od6pcc1ngaig3e1/tasisuwavupedug.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/gipegedezabopesawoxog.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc215b709c---22353599577.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=dreads+and+locsPDF 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_off0000de95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE95 18164 bytes
SHA-256: ed5a2cbd1a97e7d4f911a5ae30b764d2db61c07605f91493365e5b198b179c19
font_01_sfnt_off00010dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D6 10176 bytes
SHA-256: 34c24a2cdca3858ae4f661b969ef75003f3d10ba87c8fb49ac9f98bd305d4c47

Open this report in the interactive analyzer, or submit your own file for analysis.