Malicious PDF — malware analysis report

Static analysis result for SHA-256 38fff9c03a8be51a…

MALICIOUS

PDF

90.7 KB Created: 2021-06-27 08:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 54907a9044741eb7506f42be1836f46f SHA-1: a471b0d35e891fb94bb6d43582b25bc5b768a783 SHA-256: 38fff9c03a8be51a9f125ad0bdff62428fa0077e4a81497bb6b8ab885ff9f1db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It functions as a link farm, presenting numerous URLs that point to compromised websites or disposable domains, likely intended to lure users into downloading further malware or submitting sensitive information. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://pistant.ru/uplcv?utm_term=colour+blind+yellow+green
    • http://bukharaatlanta.com/sites/default/files/file/463674187.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0a4f36f6b---65461362362.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f747d0d32---rarawelogowawuluvetag.pdf
    • https://triosms.com/userfiles/file/fexogub.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078e2c560781---67737245412.pdf
    • http://abimobiliare.pl/pliki/File/22118727307.pdf
    • http://vmkmsz.hu/userfiles/file/pajojifikadow.pdf
    • http://zbraneklapka.cz/ckfinder/userfiles/files/36200712485.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/46306780fd8a2c765f25797c0c56f6a0/jovegabadipukaxegulus.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/tmlmhkglq4jjde6houmulu8m11/73188988625.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6fe7ab2ba---jagenavuxusogifu.pdf
    • http://stressmanagement-karriere.de/userfiles/file/gurewufelojom.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/s47vd95osjv1ppfnqeusi8atit/33484692926.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb460d99115---45227067447.pdf
    • https://haysalon.com/public_html/userfiles/file/gumabeda.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/ac05a53eca0b16affd379c62f0063ca8/jokevesinupeb.pdf
    • http://generaltubi.com/container/ckfiles/files/pawaduxezuz.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/c4421632b9289ceb8843eacd044a4767/3029334205.pdf
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/61129255972.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/38824cebe4a27ff903b999f4ce222a27/vebufamadifuk.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/ba45c477039e05cb549071d78bfb4446/85381547318.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/f26e43dd20f493c228d8872333e9fb75/16476123969.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/d4ebc7a0d47b504c448df43d832f361a/91974478653.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9d6904fe1---80347139338.pdf
    • https://unosms.us/userfiles/file/90507097499.pdf
    • http://agcslohian.com/userfiles/file/94511755571.pdf
    • http://geometrarontani.it/userfiles/files/82427785009.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd1a.bin
dc754ffea27f34430a3e25ac29c78b00da140ed5510a5b181bbdd9745da15a75
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1A 10464 bytes
font_01_sfnt_off000114c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x114C3 16792 bytes
font_02_sfnt_off00012cd5.bin
302e277b3d3c0d4a6b76e957c02dce628e43fbaa63ddddb83c8002378b6c21be
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD5 19128 bytes