Malicious PDF — malware analysis report

Static analysis result for SHA-256 4844a817c89a60ec…

MALICIOUS

PDF

92.5 KB Created: 2021-08-10 01:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4631d327a43ad66cdec5d75b820983f8 SHA-1: 7cf7eb13a63bfb39c82b482bb69d5ed41ba18112 SHA-256: 4844a817c89a60ec534bdb8cad45f53ecd83d219fa3d27ed93c2480b87150f94
156 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics indicate the PDF contains link farms pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109cf31f09a6---71530912812.pdf
    • http://omonetach.pl/foto/ilustracje/file/4675898095.pdf
    • http://luvnchrlysenglishtoys.com/clients/861429/File/33916034453.pdf
    • https://luminex.pl/upload/file/pobavevup.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ecd98ebf4b1---54664909275.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/a9jv32jd2jehrdjcig08smhl06/23707034905.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/7a6b5a03a9e1035ef53e1a974153756c/fogotelafizo.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8cbd852cb---28075212333.pdf
    • http://gtshotel.it/images/file/nejukato.pdf
    • https://breedlife.com/upload/files/59054132317.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd91905c427---25205809546.pdf
    • http://hzbmsj.net/images/upload/File/rulinojatobolubesexixol.pdf
    • http://teplolux72.ru/upload/file/sebatage.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160af66353a5d7---68989879412.pdf
    • https://yesilkoyluleriz.biz/resimler/files/14103838721.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/3sbdnj1g58iojo4r3f350ctjig/xepapaxusuzapamali.pdf
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/45499219456.pdf
    • http://krakow4you.pl/krakow/files/fawetosabo.pdf
    • https://torbay.ru/images/uploads/file/fojavanunegobuzevawodij.pdf
    • https://cornwallstaffagency.com/userfiles/file/suwiwafexemaliwamepikemot.pdf
    • https://geniodelweb.com/file/rarovugofatuvukawazilu.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f530e2ff79---49014819356.pdf
    • http://kondicionery-ivanteevka.ru/upload_picture/file/70569920973.pdf
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/40764079382.pdf
    • http://daonshop.com/files/fckeditor/file/bogepituraxuvilijixaxusi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=what+is+the+game+where+you+draw+and+guess
    • 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_off00010536.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10536 16792 bytes
font_01_sfnt_off00011d48.bin
afca72a7f54acf92009279807c889ed40c9b2c4e80be0a09e35db7e2d24fe210
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D48 17072 bytes
font_02_sfnt_off000149cf.bin
4d8838bab61167141eff0af5d744939f01570a8482347a797c1d019a426f3de2
pdf-font-stream PDF embedded font (sfnt) at offset 0x149CF 10944 bytes