Malicious PDF — malware analysis report

Static analysis result for SHA-256 4379f1120d392b7c…

MALICIOUS

PDF

83.3 KB Created: 2021-09-13 04:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f7eda1be7254cc06d154aa2d1b6a2b50 SHA-1: f79831929ff26e0f8980842bbcf39c2aa9ff0c22 SHA-256: 4379f1120d392b7cb0c14e9adee851dc26ca76da22b2cc2e2437ed2f273b429f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites. The document body is heavily obfuscated and unreadable, but the presence of numerous URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://surmounttravel.com/userfiles/files/fapusarawezoragi.pdf In PDF document text
    • https://bestrecycledautoparts.net/images_i/file/90600453467.pdfIn PDF document text
    • https://codecs.ro/images/file/14286992281.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161373dac4c05c---fidulixojulu.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/dalazawovazotujeguluka.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/53335425916.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/rawilixusuzifirabizo.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/fibozokusoliwakelofoz.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161336a73f131d---jurazil.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210903070036575.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/fikugupox.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/87969649874.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/zesiroxijomi.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/94342152752.pdfIn PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/210912094954340438gwoc3.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/dofusifavatogadat.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/3743473557.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/64645569202.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/29382100795.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314d9d09619---66292695025.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/23278552002.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/98919052169.pdfIn PDF document text
    • http://thesei.com/In PDF document text
    • https://hijaustabilo.com/contents/files/38798351735.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/mifobokidelijibones.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210912_025245.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=screen+lock+pattern+designPDF 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_off0000dea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B2 18120 bytes
SHA-256: 3606bf77f3dc32b94e77ad1c5dac00c118ff47c9413072bd7b104e8488d68bd4
font_02_sfnt_off000125f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F4 10856 bytes
SHA-256: 8daee20a09d5c7cd2ab142d1d392f21127618de490032f29739b34d105cdf1aa