Malicious PDF — malware analysis report

Static analysis result for SHA-256 defdab205527381e…

MALICIOUS

PDF

69.3 KB Created: 2021-09-14 07:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2967f79272561d4d934b9c6685291b32 SHA-1: 6092526f282b795349c41d3ee572f8f93a5e5903 SHA-256: defdab205527381e0fd04457ef4d1cb8545e2f7be0bd3bfae600960f563472e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on potentially compromised or disposable domains, indicating a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of external links and the overall heuristic firings point towards a malicious document designed to redirect users.

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://ferrocom-spb.ru/userfiles/files/mufazetepetibim.pdf In PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/55361245867.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/92957885295.pdfIn PDF document text
    • http://mlight.cz/archiv/file/tapunovamopagirun.pdfIn PDF document text
    • http://thegioioto.store/upload/files/zulejegi.pdfIn PDF document text
    • http://portableandcool.com/files/files/7494470613.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/99460116815.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/befukesobawoduzij.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/muvixavetirotijerinate.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/98768931956.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/doripujuzogebox.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jovuxefimubamopoles.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210911011752_gb4cy0.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/rotabukiwuxakixotus.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/e34eaa7b71d726eaa642a5cdcb7d6981/bixirebetewoxagiz.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/vfahotm2qplbu6sour9d55blke/bujanokajel.pdfIn PDF document text
    • http://clerus.hu/files/file/resemulebuxalidi.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/46829185653.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/93509180644.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/fudegigafalupodanasa.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613f22f3eff43---nenuwuwibiwekorud.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/70410173342.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/rirafipafulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=soccer+star+2020+world+football+mod+apkPDF 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_off0000aefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70F 15600 bytes
SHA-256: 96c05f5cfb8f27187d44dc1a73a3f263b4343326415ad1ff3803730aa5af410f
font_02_sfnt_off0000ed58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED58 11220 bytes
SHA-256: 16e13132f65733608a84530a898981fa20dd721b3fa0e89553ed0cb5cf0bb736

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