Malicious PDF — malware analysis report

Static analysis result for SHA-256 f66fe4e9ad15cf16…

MALICIOUS

PDF

92.7 KB Created: 2021-09-08 08:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fb621fdbf46e94695cbb8839c6b902e6 SHA-1: 15e2beb7f64b6fbfde3d610497a50357f96eef43 SHA-256: f66fe4e9ad15cf16a78b8a6ce6ac6d879e246bfca528ac173d7e8cd4ba5632f5
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links, many of which point to external PDFs hosted on various domains. Several heuristics indicate these links form a link farm, with some hosted on compromised WordPress upload directories. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload via the embedded JavaScript and linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://yogo110.com/userfiles/file/topudogaxul.pdf In PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/41329588642.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609827a95580c---84948947995.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/tepupufukevonise.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/lajitezufumo.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/40140515280.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/70452727839.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3ff5c8e3f---2708198306.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/kudij.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/zavuxorusedikiw.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/zebobunizezekore.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/goputitoxofominewofujuw.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/87236148037.pdfIn PDF document text
    • http://ctm.it/userfiles/file/kafoxexajivopabijaputi.pdfIn PDF document text
    • http://sns.hu/_user/file/tizulifu.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/5c4qlkbbik014895ubj2s69b9m/64397324734.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/9i66es3oj0on8e6uebfb2dnsrv/84516360917.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160740bb41f681---gidowonoxibigon.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/30495073126.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dde1945a42---wiruge.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/32879482738.pdfIn PDF document text
    • http://24cvety.ru/upload/files/56399808928.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/93866335380.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/ebdba5afb9af55ec107e77cf9d3ff3eb/lajagutiwelalojepezi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=starting+a+business+for+dummies+uk+pdfPDF 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_off00010366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10366 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B78 18424 bytes
SHA-256: f281241de9321dd2e6b7ba220d96354e7995e3a3def321887fd423876475378d
font_02_sfnt_off00014b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B51 11200 bytes
SHA-256: 0160b564cd786deda10ae8255020a0e7d39f576fa0eb263e5d340aa55560fba2

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