Malicious PDF — malware analysis report

Static analysis result for SHA-256 dac68ca9ef9f2bed…

MALICIOUS

PDF

79.0 KB Created: 2021-09-18 00:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aedd7a9362356e29147d242749b32be5 SHA-1: c21eb7aa3235db46bdf2622930a0c9ceae3da0f9 SHA-256: dac68ca9ef9f2bed60a1cf815d87e5dd943644bc0d35a1000593098f2402aff9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://crewmak.ru/uplcv?utm_term=no+more+ads+on+my+phone PDF link annotation
    • http://vektor-bezpeki.com/userfiles/files/99548452620.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/45862496618.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/wisinosipukavebizabofuxo.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/24007080547.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bd4c5dc17---11362673821.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613619e6c2614---gaxelokugexisa.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/desajo.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/88042659539.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/26814845298.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/nonaxafij.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/loparazupisi.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4fb53e1da---46491271623.pdfIn PDF document text
    • http://tridiart.cl/ckfinder/userfiles/files/loxusajawonunem.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/sopurolidakonalulovos.pdfIn PDF document text
    • http://cecev.com/stockages/files/41712648757.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/71259053958.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/xironazerime.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/tipimap.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144126178ef4.pdfIn PDF document text
    • http://weldingplaza.com/files/file/nogipurirujifefonajusof.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/jirixatimitajokiruza.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/wesenotodevotejodiz.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/zesekogulaxiselo.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109140456126082.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/161373e2d264c1---89843181852.pdfIn PDF document text
    • 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_off0000d14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14E 17788 bytes
SHA-256: 47e123b2033a9f0d3f6baca39a0c7ca6ad6dd663aaf6ba905b97ce2b4e09c76f
font_01_sfnt_off0000fefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFD 10512 bytes
SHA-256: c5853275c6ab9073f585924bd903c7ed4151429949fffc4884b2ff01d2973a83
font_02_sfnt_off000116af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1