Malicious PDF — malware analysis report

Static analysis result for SHA-256 54e311adfe7056a9…

MALICIOUS

PDF

114.8 KB Created: 2021-07-06 18:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5b1c6e47a35a3731605be0700ea6c2fe SHA-1: 5fa212b092cdbdebc4fb0de24b6deb02314ad15d SHA-256: 54e311adfe7056a9e7ffb31fa74fa003ea1db99a13f5ad0cb1e86c721196728a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://garglob.ru/uplcv?utm_term=short+term+effects+of+obesity PDF link annotation
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/32al5avr9brfmvmiaao3f7iguj/naretukerekuxiduretofo.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/tiroku.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/71374321725.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/4548434232.pdfIn PDF document text
    • http://upbfassadenbau.com/upload/file/75859608370.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/zuzuduberolasizemagebinu.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/64272406073.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/tenulodiromusoresulubub.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/40244ef6c49a87c79b7be74a193103a7/vijegalemikilatibaw.pdfIn PDF document text
    • https://master-service.ro/images/file/35125585297.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/21882742208.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/507f60836a20d7300ac5f890e198f427/bafifelip.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/c2d43f7cc9e052aa8b9a789df1e45e3c/72720233744.pdfIn PDF document text
    • https://rosycaffe.com/file/61049210772.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073d58bd74ba---davosadav.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/r1mg8udi1glidccttisrbej4l3/28027502934.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/mo163hnr4to8bou267jpptomqc/38937731790.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/17970138542.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/85339604995.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c2af5a320---vefixufarovegetefelit.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/f347061c740785fe426badff4ebd6a85/15836877798.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/pusuletazoluz.pdfIn PDF document text
    • http://slsnn.ru/content/files/fabobugiwegowir.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16070a6ddb7241---bejenipotofo.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_off00015d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D98 10616 bytes
SHA-256: 1ba4ad51dd62825f7f1c203ac7a357d35172ff535ae875da7a0ba88414972310
font_01_sfnt_off000175ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018dfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DFE 18356 bytes
SHA-256: d2897a5aa5342b63acd8617100a90b951be14dcaecac25ee6b4f92ad2041950d

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