Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c4f128e3af186b7…

MALICIOUS

PDF

85.2 KB Created: 2021-09-17 08:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 22ad88f1b29a7b65a2d2b60c5099b12f SHA-1: 1593182bb4d89ff60f922ab55e47f0be83cf486f SHA-256: 2c4f128e3af186b79f00624e36e681e7932caf9ebceee60486d7b69cdf57f7ea
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.ferm-matic.fr/upload/file/gavowowuxawidodubovatad.pdf In PDF document text
    • http://jolanyee.com/upload/files/202109112025135733.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/qpunrsv5r81qdorlumaichro33/natasazore.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fd3c66bfe---34202603478.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/56168636422.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/87483788301.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/kepubeti.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/fifemofefuloj.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-13/20210913234724164397.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/tuvisirutisega.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/fapenitifuvomunaf.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/77826161818.pdfIn PDF document text
    • http://jn-zhsc.com/upload/29324270578.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/5215433262.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/dasadebatodalevisoj.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/ravinerejakasunezupijod.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/35843727587.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/161349b55814ae---82827806488.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210910093538.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/56855517555.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/87241617616.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136c46b1a8d4---46704791243.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/giwatedufadana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=best+offline+fishing+games+for+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_off0000e9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D6 10852 bytes
SHA-256: 6de8d1d40df5456fad9ab6d25092de86d820d829827d0ca4f270c38c79972e2d
font_02_sfnt_off00011a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A79 17240 bytes
SHA-256: 6853a8269407b66b3d8140b56e5c16cb0de07af79d0333f5e361c4e773acaf43