Malicious PDF — malware analysis report

Static analysis result for SHA-256 914a94757d627543…

MALICIOUS

PDF

72.4 KB Created: 2021-09-23 19:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7c71cd927d1d0ed7c26c325d373e18c6 SHA-1: 8f8b1a6c31190c5b4b60ce5af088671e76b93dc3 SHA-256: 914a94757d6275431429f0ccf087acd5ca38165335411559ef21310445f61817
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for malicious PDFs. The PDF also hosts a large number of external links, many of which point to disposable domains or compromised WordPress sites, indicating a potential phishing or spamming campaign. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kerama.altrodesign.eu/ckfinder/userfiles/files/13641943347.pdf In PDF document text
    • http://bioaec.com/userfiles/files/zivokilojone.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/pezeworikuligafuf.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210918145036197.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/71244656779.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/19898886853.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/31470208998.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/89178276386.pdfIn PDF document text
    • https://fultoys.com/userfiles/33312777038.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/gezodopuwajilugibit.pdfIn PDF document text
    • http://belovosushi.ru/files/tukeranumorowidam.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/78744162262.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/jevukogemesuzuwajomadene.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/e83356609bbb2a5bc2f9caacef5b606b/fedezo.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/2519abcdae19a24cc3418020b49b363c/22650632473.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eebf43ef45---bigeboretirupak.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/bifewevovexewomo.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/21982815308.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/57075723078.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/14407581438.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/53741683548.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/fogunibovanofakajuwonu.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/kevivalawopijadapa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=midtown+madness+2+androidPDF 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_off0000bacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBACB 10560 bytes
SHA-256: 141800664ca7fb391f6b80ea15a5a43602dd74d2d0ff57bb7da8595626a98537
font_01_sfnt_off0000d2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F9 16184 bytes
SHA-256: 0a50b341f0af24e5ab5a71a37ed08f8b25e5d6d952b1b46ad20a61ae426d2191
font_02_sfnt_off0000fc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1