Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a292629ab76ea60…

MALICIOUS

PDF

84.0 KB Created: 2021-09-01 14:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e7d97727ace7ee584f986872e85bdc7c SHA-1: 062d5ae0c980e6c959d230502fb68a86e6cdb79c SHA-256: 3a292629ab76ea6001a8676ea1996469bb98978779156d494752431415223d96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for malicious purposes. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing or malware distribution lure. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or SEO-based malicious content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/fdb035f711a052e101860476f43ea8e8/mikimaregoba.pdf In PDF document text
    • https://rybczewice.pl/userfiles/file/zezoturisu.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/23400141693.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/efadbacc91f1994b927a6b343bc3876f/73841855164.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16250573851825223677.pdfIn PDF document text
    • http://df-2.de/images/daten/file/dobopajerep.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/5a2a4f2338e1ee5de52cc6d8a2337e78/45058421199.pdfIn PDF document text
    • http://unionzglobal.com/ckupload/files/xazolu.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-6-30/20210630071912987896.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/c919887935d5238adcaae2cdec2479ed/72935118650.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaf3b1df51---nitebabuvivibepokopira.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/a6rtr04q63vb7m18lr1shaco51/tojuxagubefegu.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/77842941831.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/a819ik9c0vhorj79vq0126gg2r/sorifipok.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/3212408604.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a60604de3---99742019982.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/derosizepit.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/591d9de251fb012e14931ee7d26da75c/10888710440.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/niposezugaripemuses.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/33566878188.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16286209306419.pdfIn PDF document text
    • http://www.bash.cl/media/file/33432078527.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/a873ba2133c70ddcee24d9b2f5cbc2c3/gekejigori.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/takus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=india+has+type+of+climatePDF 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_off0000e43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43B 17420 bytes
SHA-256: f1f420bd13c0e1fccd490b9b9bdaef55f8cfc0aaee722ffd302cfb2a9f9f2488
font_01_sfnt_off0001108e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A5 10852 bytes
SHA-256: 0627013af15c1ff1ba89c19ba20180108bc4b978c6e65312bc3dbca3a11132b1