Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7808c8790911b01…

MALICIOUS

PDF

100.8 KB Created: 2021-07-14 04:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 677954a630a887751e8e7f9b93c9e3eb SHA-1: 616b2ca1848914eb387b88e76a02b49ad5eed2e2 SHA-256: a7808c8790911b01e0d3ac5c9aee3568fd6616197a74a7b15fe3a65d82ec4c5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many pointing to domains flagged as potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL distribution are consistent with a link farm used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9787

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://kompletucetnictvi.cz/files/file/34727719816.pdf In PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/5248106352.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/tazuwebebepebapexode.pdfIn PDF document text
    • https://go2germany.ru/files/file/37370674859.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/90580894656.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16073103e12b98---59060264596.pdfIn PDF document text
    • http://webursitet.org/Files/file/nebavikejetatawub.pdfIn PDF document text
    • http://axwelindia.com/uploads/48998141721.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607951dfd3dc1---52584800373.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df976e6953---suwizuvugidavilug.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/199f46e426d30df57e7342bbb428ff18/ribejonov.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/ba33276548d5803cd86db3957899f81e/4671449357.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/bedofazufip.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/925e4bea22a29afa555b4bd3b37cd7ca/pivutujubuzuwinituzasiti.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a42b51761ab---kanemapet.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/38179a66b781beebac9d25be75cded14/sokofedov.pdfIn PDF document text
    • https://artbynela.com/uploads/file/69545625282.pdfIn PDF document text
    • http://tcmoving4cure.com/clients/a/a2/a295acc0500fd37d831de80ba00a7552/File/56603224542.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160debcfde82f2---jerotodimojotetafobin.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/3d57013ef7811dd3b8d7a51d7d5cf5a2/zijomonozewo.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/vamirutukatexe.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210710063023_554522542.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/ledabu.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607551c1f23dc---9590729220.pdfIn PDF document text
    • https://inncredel.com/uploads/87417595179.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/6744282584.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d610717dec---sufosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+unit+of+electric+fluxPDF 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_off00012734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12734 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F46 18072 bytes
SHA-256: c967f691c4cdf81c94c7d6cb7a184aef6e09fa7f3f2072836dbd4d68c686b9da
font_02_sfnt_off00016edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EDD 10268 bytes
SHA-256: 2fda8182946abb351c286174d872b753d0a2de67cd3ebdd401c17c6e039e6613