Malicious PDF — malware analysis report

Static analysis result for SHA-256 448a18efbfd0585a…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 10:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7cf98c127454cca67c00b05e70cd400d SHA-1: ae1dee7f3cff4d14b1ea2982996ac90c85064951 SHA-256: 448a18efbfd0585aa41f1a4935745c490bd481deef64b455ec73c643fdf8927e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. While no scripts were explicitly extracted, the nature of the links and the PDF format itself often implies JavaScript execution for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://synerhu.ru/uplcv?utm_term=android+app+manager+for+pc PDF link annotation
    • http://olgapolyakova.com/files/files/84318323847.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/nujezuvirorubatuwelazezi.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/69787794600.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/mefatidibanigugaj.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/mazexomejuvotanukize.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/xexezexoluvuved.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/kawewededavonipani.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/3328541018.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/78273294092.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145598ee8531---diminino.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6ba6c6314---zosefijobovi.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/tidivexexanosiwajigu.pdfIn PDF document text
    • http://tiquital.com/documentos/file/67869322463.pdfIn PDF document text
    • https://grnca.org/img/files/files/76132226287.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/sedumelolu.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/99558009248.pdfIn PDF document text
    • https://projetovm.com/uploads/files/12103598983.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/d1qbspn79kimma8bq380v4qi42/55063139480.pdfIn PDF document text
    • https://luminex.pl/upload/file/96363645221.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/98964298308.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145305178259---78161238588.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/danapaxidolopapisezepadob.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/12511899607.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/i8n2cll3ctrfbbbml0ag8n2rj5/98547358676.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07D 17436 bytes
SHA-256: a4b91cce3dbc763ce2fc7a14b307208e6630b0fcb1937cf4e9cb9c0246263666
font_01_sfnt_off00010d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5B 10632 bytes
SHA-256: 391127a0ec1ce98203adcd1c9cd1611832f0e4e39f5f55d8bb79ed7481c797ba
font_02_sfnt_off00012568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12568 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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