Malicious PDF — malware analysis report

Static analysis result for SHA-256 b399618869e2fa9c…

MALICIOUS

PDF

102.6 KB Created: 2021-07-21 14:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 4e08b5f0737b4b727ec8995e15561285 SHA-1: 07261da7953fe0cb1cf012e29fbf059c25ae6cbf SHA-256: b399618869e2fa9c039a135a84223398caeab07eb2b6374f4fa2c5a0a8056652
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://lws-realestate.com/userfiles/files/86217592802.pdf In PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/d8df6b0014a33313186675331de3dfde/87298581948.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/5eoh19rvkg357tm6avjivmijv1/31295596933.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/xarifadofijozosetag.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/prgshn2qg69ifmopkbrsslk05l/44540430936.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/bowivotubinosa.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/7350636257.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/60443705812.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/bagaxanidamevusulozetuxeg.pdfIn PDF document text
    • http://goldmustang.ru/files/files/tumab.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c2ca861ed---26528170135.pdfIn PDF document text
    • https://bursac.net/userfiles/file/zujaneduputuwisokuban.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b4579be1583---99114099369.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210629175848.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/6hell6o61s9f8vavj86tl29j00/41138854406.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/um8sp5f7ur2urchs4sdl0vmjvr/xamanafito.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/88232630045.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb2ebe2830---komesezajivax.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/11726465393.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/4459190361.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/cd9ffd6f9909a1db48348abbd7f17844/97246123398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=law+abiding+citizen+full+movie+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001166b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166B 2192 bytes
SHA-256: d1cd6c3e4179633ac88e7b7972b6d52881dd42560b9709cabc2cbac8bb7519ec
font_01_sfnt_off00012046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12046 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13858 23580 bytes
SHA-256: 16b8f5f7b1cf8f4a04fc67dda870e648aafdd4cd163eeb4d70f14ae765a5af6a
font_03_sfnt_off000170d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170D5 11060 bytes
SHA-256: 7068d07a528ad0c0edbfb3da83e482ebf79d0100a0c7b0d1a9fe9806e9c55de6

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