Malicious PDF — malware analysis report

Static analysis result for SHA-256 9899880a7a0ad475…

MALICIOUS

PDF

71.0 KB Created: 2021-09-26 11:37:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 578ad4b1ebe19afe7079e9294eab83a9 SHA-1: f2f9c130c0149a2a5217778657772ed8d645348e SHA-256: 9899880a7a0ad4757120a562185927eefd2eb477e7795e3fbc26baef2f81acd5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised websites or are part of a link farm strategy. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. The presence of external URIs and link farms suggests an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://kancelaria-perfect.pl/app/webroot/media/files/gonigawewigutijavena.pdf In PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/kigopetagepaladovekerad.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/77085873792.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/21211327420.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/51329774829.pdfIn PDF document text
    • http://linza-market.ru/upload/files/tivimesisuforotisiditu.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/kilifadariral.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/raxilulozewijunanizo.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/gezolima.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/57128430079.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-13/20210913070655297719.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe233c72cb---bogukanojixoxiz.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613740c41932f---72426415042.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/62139934778.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/namedebiguw.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d018870f1f---67871888019.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/pajugor.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/pha1pub6sefklaug8f0pv2jr64/depapowulogawedopemofat.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/86562736241.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613384bd9ae42---21474847079.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/2951828768.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/8ih5mke6kv9a9le6nqfn02mcf4/kajav.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/moxev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+set+screen+saver+on+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_off0000b3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F3 10460 bytes
SHA-256: d6a26ec9d243acf2fccd9286b8fe928e8b57209efddcd7dd79d717b3626c42e0
font_01_sfnt_off0000cbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD9 16608 bytes
SHA-256: 8e2227b8fa3bba68ac9fea1cdcdbf8f298fd98a2d2f14cc0939f585bfd2cdc0f
font_02_sfnt_off0000f60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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