Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2397d7e2517bcd5…

MALICIOUS

PDF

83.3 KB Created: 2021-09-01 18:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 66b41aec17860aa437b9f1082fb0f266 SHA-1: 76cfb72db6a5152c8bd072c3343ba1ee03374c08 SHA-256: c2397d7e2517bcd5416e998124c1054ff5bdf28c6196d89b80e7ce6f32537d0a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers confirm its malicious nature, likely serving as a phishing lure or a downloader for further stages. No scripts were extracted from this sample.

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 http://baaningdoi.com/file_media/file_image/file/kekenunas.pdf In PDF document text
    • http://adabaskimerkezi.com/upload/file/dinapifugumoruvufoxu.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/34429491221.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/6tlsu8t82ftvd6ueu5m3bh4eg1/jumupekakalapudugas.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/2b6bc2a1a9e76c69edcc11d56be6d288/80669325635.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/7pv4bkrmjlobm24au8lmg6dpuu/topitalegutafenabari.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/puvapelabukitawa.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/25404696898.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609403e620610---roladebuvaxotusar.pdfIn PDF document text
    • http://tonystelly.com/clients/873487/File/88764515370.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/7549e86448017de0ba942cba3f5241aa/bofikekosevolimudod.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/724544574.pdfIn PDF document text
    • http://hodori247.com/uploads/files/55921434766.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/c4abf57e0ce73327d155e2aea988b2aa/40298568446.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16110cb3a765cf---tiwemulimimagibuk.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/67438626680.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/a76b43b6a695750390efac18b03fa8b7/xigaxaludaliwalovinom.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/34845321179.pdfIn PDF document text
    • http://bakoca.hu/files/file/rarepazomiropevapoped.pdfIn PDF document text
    • http://teerosy.com/ipp/images/uploads/files/69328714065.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/59917733492.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/voxanugatuzarusoku.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/7865d907e918046f27872aaf88cc3277/worizolituvijevivitazat.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/7e959cc9c74dde00eefdc42e3eb1682b/61579338096.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/vunajadotonozite.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=why+does+paris+go+to+juliet%27s+tombPDF 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_off0000de01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE01 11244 bytes
SHA-256: b3833adcc706e1d11d6bc8aff6ae68bdaa71770a0b07d6f97f4e65c5abeacb96
font_01_sfnt_off0000f7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001100d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100D 18332 bytes
SHA-256: bd21ff43ca5e15df6c25849d0e53aa51c8528f0d2768a2a45e17680ced40ca11