Malicious PDF — malware analysis report

Static analysis result for SHA-256 a497cfcdd11a35f6…

MALICIOUS

PDF

78.4 KB Created: 2021-10-07 20:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 95e9e37a170a3e2ec10e92098f4328ec SHA-1: 363d4b53a5d5c3777ff26047cbabd85d2bdc0c24 SHA-256: a497cfcdd11a35f699a15f6b439a8b44a483095a6e8df08e21bb45abb70a7157
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised websites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://kisito.com/userfiles/file/63702797065.pdf In PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/59567636329.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/54910773720.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/88834400588.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/84294257244.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/22214396733.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/nirorifotagamu.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/21004499227.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161497c35d0722---14753430969.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/xajuragat.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153a16fbe904---ruzelasufix.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/xituzetadutiwe.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161482f9be492c---dopipipix.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144854d28151---14314942512.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/56912441548.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/a99eef8d35fd5db7d8764fabe145a939/rixajuriza.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/85921337805.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/xifumu.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/82677773497.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/viwapij.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/66254209434.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/vumagid.pdfIn PDF document text
    • http://lse.hu/userfiles/file/mibimij.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/18710810464.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614893c74f351---31861563551.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=download+apk+using+play+store+linkPDF 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_off0000cb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB01 10960 bytes
SHA-256: 3b069ae361494a780539a18d958d811af85f84fa7576ef71d532cd457ceb4f7a
font_01_sfnt_off0000e46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46A 18196 bytes
SHA-256: 7b86c70a76d7d81dadc885ceda63c33a34e056357e76f827ffe22f2e9e026d00
font_02_sfnt_off000113ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1