Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f226773a87a48ce…

MALICIOUS

PDF

113.1 KB Created: 2021-09-07 01:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2e809e3634ad7b9b619a49f4dd8f2367 SHA-1: d1f8e5dadb43ec1630b467c3b76e240efb57546b SHA-256: 1f226773a87a48ce1ea968aeb1956aa674c404f1207e6aa062e72543d9add820
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites. The embedded URLs and the overall structure suggest an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://shengnabei.com/uploadfile/file///2021061903352230.pdf In PDF document text
    • http://tongrentangthai.com/UserFiles/file/3121918315.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/84546460666.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/2uc44cdg8grqdn0puhrd9g0a93/kasifesare.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/bifeforedofizawakubato.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/3hme4t2u7doqa43a2qnr6gdij1/tuvenu.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/duloleninodamudugilegufu.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/relabawamorezifiro.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/54546210279.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608436c0cd3a9---janafarazidofuxesal.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/titexugij.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/bc122b15664492584918408974d213da/41055603141.pdfIn PDF document text
    • https://bursaangka.com/contents//files/gelozelizalisupak.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160890936a6b63---kudomuwuxivaniwawizov.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160810b0897175---savada.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/c26b2950a6451f4000abeb479694df39/gopix.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/80bccb23fdf854a7668431344f5b107c/jududiwodiforidar.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3b7bce423---90594188080.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/bivasuwowupa.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/kinisukusu.pdfIn PDF document text
    • https://edusfera.pl/upload/file/80160621932.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/29491452683.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf6940c911---vupubisujitukukupado.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=lds+institute+student+manualPDF 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_off00015598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15598 19188 bytes
SHA-256: 05fd56cceccfacf9b2ab7636aaedd2b9749a1823eb5127792d7807d3458d9895
font_01_sfnt_off00018784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18784 10244 bytes
SHA-256: b9a23dbcd5aab52c7dd5211ef01f98400c45723fa3bab609e580d1d270934b56
font_02_sfnt_off00019e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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