Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8d2282e5799d09…

MALICIOUS

PDF

75.4 KB Created: 2021-06-27 08:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 54fe9c097139ac43896e3aca62646dcd SHA-1: 0840afeee2d60429ce145bd62599511174aa84ef SHA-256: 4e8d2282e5799d09fc6b14fcf8a4f0037cae90723c3828d5855bf8a087b16eec
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. It contains numerous links pointing to compromised websites, suggesting an attempt to redirect users to malicious content. The presence of external URI heuristics and link farm indicators further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://foodphotoshop.com/userfiles/files/zawoje.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608441f37b422---feragekirexuse.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/d959f9512aeb3840e88ac5c9f4110e10/11157349824.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608882fee387c---natibivokoxiwodiwadakusu.pdf
    • http://thunderstar.cn/userfiles/file/20210509232243938843751.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d11c07e13---75102587604.pdf
    • http://wecans.net/_UploadFile/Images/file/58387859448.pdf
    • http://erdbau-rauch.at/jelewawemosasureravuzunu.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad1f52a27e---xelajekirakatawowi.pdf
    • https://papiratisk.cz/soubory/xuxolikup.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f042b7ec76---genug.pdf
    • http://csc020.com/userfiles/file/20210620005755_9dm40b.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec7ead2360---83137537298.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16099e996a41f7---kitonuwodoguzuf.pdf
    • http://sva-jeanroze.com/xmedia/file/mugufur.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/92bc8d2457d70ff1edd374c9e022a69b/20960654266.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd814f34c1---18924471940.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47c98e7600---wasopalaxobeja.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/ggfmpni7faga6sc6ihl7ac5m75/kosimurevulufomogod.pdf
    • http://vinhomeshaiphong.net/app/webroot/img/files/96722349674.pdf
    • http://alphanaturehk.com/userfiles/file/xulokuzawusowumote.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/4d256baa38565f34f19e79b2fb8cec46/xuvepusijusonifeg.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16094734078702---80617566560.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=types+of+nutrition+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c522.bin
eb433288e691829fd00fa1ea2eaf6aeaec4f3fa8b235a591ff84bcbbe79a85db
pdf-font-stream PDF embedded font (sfnt) at offset 0xC522 10460 bytes
font_01_sfnt_off0000dd08.bin
633356b024a52ba43b2880dc43b95007009875cda55a038ed4e0b26a7f786186
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD08 16184 bytes
font_02_sfnt_off00010702.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10702 16792 bytes