Malicious PDF — malware analysis report

Static analysis result for SHA-256 02735f25fd2731ae…

MALICIOUS

PDF

88.1 KB Created: 2021-09-18 17:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ad39b8c269500fe31d22c390c19acc58 SHA-1: c51af02ecabce2d9c8fda623d27ea34c1b59344b SHA-256: 02735f25fd2731aed68556e665a9a8da839c54053ecff7e16c7ec47368f510cd
116 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a link farm and the ML detection suggest the document's primary purpose is to lead users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://liccuza.ro/stiri_files/file/jixorimakaganafetadukiju.pdf In PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614117a6e1fe9---58000621359.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/muwaxoperowakiwolizam.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/39064457456.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/24064751486.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161398ce25b385---62055477787.pdfIn PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/27849645155.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/165211986.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec4839ffd3---sagawozexa.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/subor.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/zezurizutixexesat.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/luwodofubibekebekukozot.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/79993613181.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/75918778647.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/3085373319.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/54193241306.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/83965647234.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/35679830124.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/repikojojegogepamupodugo.pdfIn PDF document text
    • http://xhzhengli.com/upload/seloxifixix.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/muvesoguxojeten.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/7360631088.pdfIn PDF document text
    • http://leise.ru/admin/ckfinder/userfiles/files/79733906090.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/21714810894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=come+si+scarica+musica+gratis+su+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_off0000f163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF163 17852 bytes
SHA-256: 8ec3d1eca687252b45642e85ee09e239dc40bfc57cd64e2389fd6bc044f5b0a2
font_01_sfnt_off0001203e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13855 10800 bytes
SHA-256: 8eb6bc1f58646acdb61dae0807bae668889fa10b46a96f9fc713bc153867bc62

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