Malicious PDF — malware analysis report

Static analysis result for SHA-256 368fe57af31a86ee…

MALICIOUS

PDF

81.4 KB Created: 2021-09-03 21:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7715a721e8d18e561cb36642e5784874 SHA-1: 488cd0a999b95cee4c1f7d4fdb9edeef142072a1 SHA-256: 368fe57af31a86ee00e3b15d4e3bf0cc8bdc52b969d180a262c514b9d9198bc9
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised or disposable domains. This structure is characteristic of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://uhorder.com/upload/files/remigiwagizereregaxaf.pdf In PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/lolikadoxefun.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbb48ad0d5---rogapagales.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/delifuposudovefanepinef.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/jotivemonekoliwa.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/24b1e1fe179f621d20e0647be5a0cbb2/2952213661.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/wuginojiduxeb.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/65904189757.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/svtd3j4bvpkk1nqf0i55lqg7j6/balomolusubunewabipape.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607752824f16b---59660048494.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/varovinojetebetavubi.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/19818969451.pdfIn PDF document text
    • http://cochemical.com/upload/files/revazuvimoku.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/85900065660.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/55985272538.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/19848189451.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210602_5022AC248A7DF89C.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610be145dedec---ruzaponomomav.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/wotaguvifogunar.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/40902363952.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/3833993423.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/setudosexejokel.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763f385388e---16194785417.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/354191432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=exothermic+and+endothermic+reactions+worksheet+answer+keyPDF 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_off0000d9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CC 10964 bytes
SHA-256: dc54f099580a3a33545ac58e57d906bec14b116d15dfd9c5a21329cb95d3c7f9
font_02_sfnt_off00010b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B29 17472 bytes
SHA-256: a2dc7ad56c284c074ac8e0cdf2cf3241aeca935dc1cb4afdb2aaab5abeccbe47