Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad472c733981dd27…

MALICIOUS

PDF

80.5 KB Created: 2021-09-16 19:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cd7ec13e2d02a6f1ddb85ec061329770 SHA-1: a46a21530b6c32e3f6ab0c88a3203d6fd7c2205a SHA-256: ad472c733981dd27d4c298042c8e5c8f393061292b9264d8a156658ce7c59da7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which point to compromised WordPress upload directories and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f65250fba2---banapezalomudabikironed.pdf In PDF document text
    • http://harchovyk.com/userfiles/file/88260145999.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/babixazapewif.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210910150118.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/88948873038.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/bisomikamajot.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/44265807043.pdfIn PDF document text
    • https://alariel.be/userfiles/file/jorumodolu.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021090112351273499.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109121148244900.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/54e452cc3487754dd863dd2d99cd4266/dekipebakutoxogopuvukosef.pdfIn PDF document text
    • https://shevian.com/images/file/sedor.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/11147251591.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/kulutanamesepubapowiz.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/sukivibulajexa.pdfIn PDF document text
    • http://hybsch.it/upload/file/43841191091.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/dagekumaze.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613652f6212b5---xetanozoseligo.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/daxida.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/56922585047.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/bajafunufoveruvolebameni.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/jetinovodupi.pdfIn PDF document text
    • https://finliz.lt/i/File/vejitolizolabaseje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=cara+hide+folder+di+androidPDF 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_off0000d6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C4 10216 bytes
SHA-256: 35f4146025ae1cbfddcba0498fbdc0919b908ba602607a623bdb512d38ea1882
font_01_sfnt_off0000ed88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED88 17948 bytes
SHA-256: c0c4de2707dd8005d2f4cd1a9d7bdde901fb8dc8d17ea380df16871508c960ea
font_02_sfnt_off00011c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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