Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b74927921d35761…

MALICIOUS

PDF

92.1 KB Created: 2021-07-31 10:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ff3ff5179f065e2e0e0dd3ea3a60596d SHA-1: 56e86d6a4b05aaf4c179e20d2e2e73422cd35aaa SHA-256: 8b74927921d357610537923abf045e39ac660480bb346b46a35785a4235d786d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data, suggesting the malicious functionality is embedded within the PDF structure itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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 https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f89f3216ff9---toverapusazo.pdf In PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104d659b5814---xakuxewilivelaxexawuxudus.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc1ac873f1---46762411227.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/zapepovi.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/79093566118.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/oqhus7os2m2la2f6fnh45aeva0/20848637691.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160decf9abbc16---faxujebatemilasisabonibi.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/14892633669.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/a6p22tk0d4j3b34hgp63637isn/zijewigejuso.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160890732b82a3---bomodinumizowezowunakoma.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/gogopomebowomugijenageme.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090580a3f80d---15834912566.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/90ofj1uq2ms6id89sr03eu10t4/nobasogizosisew.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/dcd16bcb13d580d217cdeaeda2998e24/pevijo.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/14964465482.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/91609352244.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/97396002786.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/gumafaxu.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac189753d2d---jafosulamunekabusawiza.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/39753694878.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/gutisolulisuguwuvirut.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf47ad1218---56878684571.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/43961400395.pdfIn PDF document text
    • https://triosms.com/userfiles/file/xasadefu.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160736387ddf42---digomajoxosamupifubifufuw.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/97242451899.pdfIn PDF document text
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/noravik.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/jupaxinemewow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=ark+valguero+castoroides+spawn+mapPDF 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_off0000fe90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A2 18304 bytes
SHA-256: e31af927626a0bcbca58ec4bfed6d3294cff2e97acf9573e69be7a6b834fc759
font_02_sfnt_off00014582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14582 11180 bytes
SHA-256: a7c2a27de8e6559164fed944a0c12ee3c8c348ac28b2dc38a45a0753ca0b9a6f