Malicious PDF — malware analysis report

Static analysis result for SHA-256 25e9873d88f59bdd…

MALICIOUS

PDF

83.5 KB Created: 2021-09-08 06:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6da91a2de0cad6af1704419fa629dbfa SHA-1: 0bfdd0e58d78d01fcbf172c4ead073a0d709ef58 SHA-256: 25e9873d88f59bddcac1d2b45e0242fb6b663071cbb7176c33c8d4e1883291f6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of multiple external URIs and link farm characteristics strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=manual+mitsubishi+outlander+sport+2015+espa%C3%B1ol PDF link annotation
    • http://opuspointpartner.com/ckfinder/userfiles/files/89505081527.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/fifufazot.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/41272778708.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/592047164.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/najizakavolowuzumavuj.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e43b28c507---63775387534.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/lidutodupikakapusowo.pdfIn PDF document text
    • https://dejavuruse.com/userfiles/file/65724044374.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/57883991101.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee39eb0477---73288791319.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/1l2fn6jvi5bhcaa0laiv4sda03/wuliwefe.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/zilemuvaxewisetazekiluder.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/gosapiledax.pdfIn PDF document text
    • https://kimansion.com/uploads/file/zanisumonagodona.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/xomedudejozonedetu.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2437163e78---86011565037.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/43d2b90df6d6edf328f07759f4d51582/lapolopujijigoxafow.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/zetasakurufowupibawaxanas.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/f66da99bd0f07f064c79be201f0d78bf/62533813819.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/zunotezulopuvumubevab.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/b7ed6e4226158bfb0006d07077bb8684/zuwipevikatujukiwo.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/78803440844.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/vemasoxopup.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/totatatumituked.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/30449060422.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_off0000d70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF22 11524 bytes
SHA-256: 8c1e2e14023312e9d15c7f389382856c66715c368bebd5705d9b7ae5c7313e14
font_02_sfnt_off000109d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D1 20044 bytes
SHA-256: c85ff46ba62fa71f99ba0bb55ca68a63fd71b6cfa4aef9a419aee4c845481677