Malicious PDF — malware analysis report

Static analysis result for SHA-256 436d71c65885fbfe…

MALICIOUS

PDF

86.7 KB Created: 2021-07-05 16:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a69ec3af6ff64559d048b94a00acca7d SHA-1: 86bc1b38735ada97fe5dc94ce28807cd97b096e4 SHA-256: 436d71c65885fbfef5e466810f29bc3ceee468517b03297ad3cc129c22177b03
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution lure. The document body is unreadable, but the heuristics indicate a focus on directing users to external, potentially malicious, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c590861fb96---95522313732.pdf In PDF document text
    • http://alnoorcity.com/userfiles/file/dopobamis.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/wodotimidurexexebepitadij.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/e6g68u4fsv31fmu44loh1s3u3b/pokuvaboxezawujobemovikig.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/wubuludasik.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/16683261516.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/7109d166b1027738f4b1c8a409c4af4a/64112620253.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/184f46a91668035736739858ba50725e/bomawulejubevo.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/40517881709.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/11137807188.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4686d5181---vadaxasagiroba.pdfIn PDF document text
    • http://charivne.info/images/file/10224895221.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/26831650631.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/a3f6d617dac52e9eedac099f47781ae3/lapuvifasotosafejom.pdfIn PDF document text
    • https://chptravel.ir/data/file/84106050050.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/jqk8ksgnbbkah6b8naililcigf/xiviw.pdfIn PDF document text
    • http://renknh.com/ckupload/files/gunekukaxesa.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/49316110774.pdfIn PDF document text
    • http://hillandbrownfamily.com/clients/76964/File/28933692666.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2ada3c7c7---18508326517.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/wagume.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072dba281ed6---jepep.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-30/20210430001458182907.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd48f3735e0---gikuxizurunukinitaja.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5fc624193---24074263877.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f980d6a65e---xetukikiwijemekumivadek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=pistachios+and+dogsPDF 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_off0000f2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEC 10372 bytes
SHA-256: 57556cfd537de179136819d7329397fc532bc5fe1224a7f71aede28400cd5605
font_02_sfnt_off0001221e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221E 16308 bytes
SHA-256: 946ed48c15a7bfd78a011fd19f22e4b416164ee8793cf5e729658264b8423804