Malicious PDF — malware analysis report

Static analysis result for SHA-256 b568287d779233f7…

MALICIOUS

PDF

81.9 KB Created: 2021-08-20 13:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1086ce4b726118a1aa1ce9046a12c4a4 SHA-1: a9dcbe3d761c215fdfd54a45cbed6d5b18fd1358 SHA-256: b568287d779233f7468b153df54f98a489e1f2cc490a53a1917c61a2520d82fc
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The primary attack pattern involves luring users to external sites via malicious links embedded within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://japan-railpass.info/images/blog//file/funupalipemavexe.pdf In PDF document text
    • http://allycatering.com/userfiles/88027213523.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/toxojuzibasigepipa.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/31222832911.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/xavujajimuvuzexel.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/52206688112.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/okbilds7ckf11moj4c45q245dh/rakifuzoxevulolozetukid.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/sironojanudux.pdfIn PDF document text
    • http://learningkey.org/userfiles/jiwosibupi.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/60414389799.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/41084394034.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/72ab2cbf43c00241c04a8d2961a67674/lewirezulotimili.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/450c15ea5a1cc750147cce7a93be9873/20656155119.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/acdafb93eb69be77bab5e3626481b30e/sosuvisik.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/51771969885.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/98479133465.pdfIn PDF document text
    • http://www.smartlandgroup.com//ckfinder/userfiles/files/zuzijudebulukadupebitiril.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210525184153110.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/bujogogilufukorutirem.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710a79d8023---394310921.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/e4560a10981808f04b96262f5173dd81/jorogir.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/d9b2fd32644e9d7928341173f15785f0/56985272215.pdfIn PDF document text
    • http://poiskvod.ru/images/file/32402839945.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=what+are+the+10+branches+of+natural+sciencePDF 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_off0000dc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF485 16960 bytes
SHA-256: 824011bb9e8a671e9edf3f3173ed1069d08b0e8e2e7b1413a02b0ea3533665d7
font_02_sfnt_off000120b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B2 10840 bytes
SHA-256: f2adaaf1154e038aeb19764601ddc7b5037df0bd671f743e2628bbafd78a69fb