Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d0d631e4a3dfd71…

MALICIOUS

PDF

87.8 KB Created: 2021-07-07 08:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3ce171eeed29e9c0902c97f18c80bb8a SHA-1: 43b0fc316d2ee7c90e24cab245bb2706872bfc7d SHA-256: 2d0d631e4a3dfd715b71505ee819bb492e8f5fed958c384fb140a7140d1af4d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of a link farm on disposable hosting suggests an attempt to obscure the ultimate destination, likely a phishing page or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/01927909282198ac602b438975c1f531/69420271929.pdf In PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/67385174007.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210506165302.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/lediritorubibevoxi.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c6301bc73---wotijiru.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/fd39e579f986b0b7af58b715b0c3c156/lijubuwup.pdfIn PDF document text
    • https://europartner2.pl/uploads/82484156750.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/zutuvogubef.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/kuwek.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/14296512031.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/nefenelelatexadetoti.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/72244506265.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a59e4a0724d---naxebalodowaxapomuzafosix.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e814f4ba87---82885187298.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/h7csd38qbbbvbl8jo0kpf6cmec/32127720421.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/54c8aa8f714a7833f42de9d509353892/xisumefolixakimekumurow.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/1108525108.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/fbeebceba4d56a732a2f83b8a782299e/37031644451.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/podareguzonozije.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/69024476025.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160baafe34c963---xuteravefowosuladozakazu.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2078d34cd---52000040895.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=valence+electrons+meaningPDF 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_off0000db9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9E 16484 bytes
SHA-256: 64794009602ac6320d6f342430cb293439fbf1283c26b0c70b0cabe2bef15953
font_01_sfnt_off0000f231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF231 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A43 18016 bytes
SHA-256: 89e66645afb58c2993d7b1e3206cd66ba1ac2c07f902edd91bd67e0de2e10d1c
font_03_sfnt_off0001396c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1396C 10540 bytes
SHA-256: 7e51f9b19f182c0d5dbf66a499b025856d8ec83fe4c60b8990a2522ad1855d86

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