Malicious PDF — malware analysis report

Static analysis result for SHA-256 a787c7180331a018…

MALICIOUS

PDF

74.2 KB Created: 2021-09-16 11:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a73338edad7d1f521a00101d2ea6b0f8 SHA-1: 420a78a020b266d4d83ef6626e98eaf601b3b040 SHA-256: a787c7180331a018f07edce44bee3bb1d153bf8e65755aabc56fac1ab8897785
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://belovosushi.ru/files/rifadukasusunilogagujef.pdf In PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/66376500748.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613819a8ca464---lokabodifijifuvegoxe.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091522365173499.pdfIn PDF document text
    • https://badoza.net/userfiles/file/62796044166.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/xijedubuzapapoler.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/912718586.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/69178369253.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/16425045108.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1613e474f4a317---34293019816.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/wasijunerurefoxilo.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/muxadodatiferezumem.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/6rjsi7csv77kl8fbm7endi00ph/tipikejikedudumefunide.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/17874894790.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/bidiradisojitus.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/45081565383.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/9322128845.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/kilapaw.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/xerazulakozasomodotifi.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b82c7bf42---32207981806.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/75484989719.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/guvego.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/69741745482.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/11436092524.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/77826574362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=undertale+undyne+the+undying+fight+simulatorPDF 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_off0000be82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE82 11020 bytes
SHA-256: d3a1bc2cf61d2e8e64d7517511c6eb6a16f6e6da35652cf0e44d310a80eb34bf
font_01_sfnt_off0000d7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B3 16488 bytes
SHA-256: 62ba816161dcb04bc18345b21aefb104cc4e66e4b45c742ab93b86bd2474bd6c
font_02_sfnt_off0001027d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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