Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3d5fd53d48e527…

MALICIOUS

PDF

86.5 KB Created: 2021-08-25 08:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 91c4d866c06cd579a4397e0862927ece SHA-1: f87bc085b48488b05f68f1e28c7629c42726b4b6 SHA-256: 5b3d5fd53d48e5277d0eb86afd2eb2b85d76af8f086cdff18acfc629d9bb20d0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the document as a link farm designed to leverage search engine optimization for potentially malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16090311ede06b---fasulibex.pdf In PDF document text
    • http://turagent007.ru/userfiles/file/73742909228.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a25752d3fa---11399044475.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/zavokibumula.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/zijupivomezubi.pdfIn PDF document text
    • http://c-amc.com/upload/files/dulemajujabawifapifatoge.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/vibiwurepasenumudigezaka.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/xisanurobopulogipefo.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/tvmfuroturtau7k7cfcgmr6ec8/nodageripaviwisex.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/zalujasin.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610115f04fef9---47394377310.pdfIn PDF document text
    • http://tfforming.ru/d/files/44738710706.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/telol.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/vadaxipivefif.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/63211455504.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/7985679530.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/3af73763f77d4c1a2944d1a1d1e04498/79459948579.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210807030543.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/73b7ff24f21f0044b336daa35086f62e/xeseforavofumewutan.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/sosiramib.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/71387015579.pdfIn PDF document text
    • http://screen.by/images/file/kogoj.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/51361006225.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/2849187551.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=differential+diagnosis+of+perforated+peptic+ulcerPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/zewifixanamilujologiwojiv.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92B 16092 bytes
SHA-256: 98bcec2be85b547d266a48c61dccc50816b624367bf69e2f194f2b8087d010f5
font_01_sfnt_off0000ee68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE68 16836 bytes
SHA-256: 9f6e9af0f8acf531b48e5dda1af51c71b3ad3bdca7c470f129a291950d297ad0
font_02_sfnt_off00011a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13279 10896 bytes
SHA-256: 32caae352a30eded0fd79a5a4b021a3f08c5184a1a7ba03b036ea1a499ddc8d3

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