Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b52df338cfce201…

MALICIOUS

PDF

85.1 KB Created: 2021-06-26 23:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5636089973cac0b1cae411a2ce3cece7 SHA-1: 1f7d18bd19cd0c9e33fb104094d5dfd09feb91b1 SHA-256: 8b52df338cfce2018e44f6887dfbe4e7a8a747162a49ad33ccd66e6cfcd6aee7
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The presence of 'utm_term=student+learning+portal+login' in one URL hints at a potential phishing lure related to educational portals.

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://catamma.ru/uplcv?utm_term=student+learning+portal+login PDF link annotation
    • http://somsit.com/ckfinder/userfiles/files/80270364750.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/wozexixosirakilekoraluxi.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/dudukefopobu.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858ba5e5ad2---pefikowaxujanibulerupol.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/zorelege.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c341e50067---49681712243.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/6dd40d5c7a170c3f056197fbdb1419b7/zawepufadugegimexerijeri.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776de7b7a67---burujutibakuparip.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/59858783163.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/35e8dfba667ed0cc75eac72ece8d155e/bojiwugurotuzu.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/27475045831.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/9ccaac98ce89fac28a86ce094447187a/82307790615.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/bbffc517b53ddd428d4f15323aa016db/werelaxenegukafasapetalig.pdfIn PDF document text
    • http://amandamaitland.com/images/file/bezogivemadizuxabibazaz.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160905109ad115---butinowisega.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/204d9666a03c4fc65516f8ad6b87bf7f/jojomima.pdfIn PDF document text
    • https://hostmegasoft.com/calisma2/files/uploads/wepumexogegujonixisax.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es//ckfinder/userfiles/files/27776710338.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/efbe2797df2235aca6fb08b515c535ed/bokezuvutapipozobobexepon.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/wurifutapezemiforave.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/wobumalunino.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/36759918255.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16087776a8f121---gowesizirot.pdfIn PDF document text
    • http://sooclose.eu/upload/File/8832189103.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/878a3b464ee50e0a437d969f5b04a715/lutafi.pdfIn PDF document text
    • 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_off0000ec3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10454 10572 bytes
SHA-256: 237443d8a19590277fceb2f93525300945bcdb1582f5624756febba15b841033
font_02_sfnt_off00011c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C55 16504 bytes
SHA-256: 8f8dc3cacc5719d663faa67ad3c054de9ffa562586f3bb089d6aaf2b36e87d1e

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