Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ddac1a218e08bd…

MALICIOUS

PDF

87.1 KB Created: 2021-07-13 03:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 88daa8334e860e749f8cdb155fa92623 SHA-1: 253648b3819ff5fb8d480a4bd0fb49a41d3e61b4 SHA-256: 86ddac1a218e08bde4f6f7124b12ef67f941d92a6ec3e6183a322b27c782ec98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites hosting PDF files, suggesting a link farm designed to distribute malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to obscure the true malicious destination. No scripts were extracted, but the overall structure points to a phishing attempt using a link farm to deliver a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608097854ea18---kepiwipul.pdf In PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ac408f09a8e---9994511167.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f877aa6fbb---relejizaje.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021628559211338.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc53e86aa9---31543380519.pdfIn PDF document text
    • https://noddy.nu/images/file/jafomunadu.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071feac93ff4---51008798323.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbf89750374---rinezurokunazujapamasof.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16075148a9aed7---44604043903.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1fabe64e78---sukipuzexalazanat.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/78889810420.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/84669632102.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/51095192925.pdfIn PDF document text
    • http://plncse.hu/php_data/file/bolurex.pdfIn PDF document text
    • http://calzaturificiocatia.it/userfiles/files/fufinutubowozikuso.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/xegekoruvokorozexef.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/12003509480.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/131e2d77a1fea38e20a470ef8a360666/32544502989.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/sonisapo.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3d5f81532---jurezazugitura.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qo9dsfdh9ui4obl71phaafnd50/78761976993.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=mp4+movies+mania+free+downloadPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/bivawozudiguxufiz.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_off0000f25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25F 16916 bytes
SHA-256: 438edaa456f76dbf441884ecddf9421572f560b8e151e7c478a64ebe35088d8e
font_01_sfnt_off00011e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136AE 10784 bytes
SHA-256: b7d8d3318dd35e5ac0894ac7994a9d1ac64ee1f191e2abdcabe841f33780bf2b

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