Malicious PDF — malware analysis report

Static analysis result for SHA-256 62820be77f3e34bd…

MALICIOUS

PDF

85.2 KB Created: 2021-08-22 03:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: be00a64ee524af1c8ccbfcb0dbf5d296 SHA-1: 6034e7e9791e7427a77e2b33fe1f36b5ee7f3cb1 SHA-256: 62820be77f3e34bd8bc71070cc24f218ef620d38232809389e2e0fd2c4a35716
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as phishing and a trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites and disposable hosting, designed to trick users into downloading further malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://krisoc.ru/uplcv?utm_term=nitro+pdf+reader+64+bit+free+download+full+version PDF link annotation
    • http://stepasidemedical.ie/images/uploads/file/fugufalekimabuvaki.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/93049640491.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/12/file/20210512_034815_188.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/zufipokojukikubog.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/kewevesifejuliwadomep.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ffb0946cf4da5d03082cde58e341deeb/67046494821.pdfIn PDF document text
    • https://petala.gr/userfiles/file/82700007957.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/55391060213.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/26612432908.pdfIn PDF document text
    • https://tepihtrava.rs//files/21301029009.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/migugoburekab.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/lesuzaluragagovomezinorot.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/75282856905.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/segabonoxedovomeju.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081b6f835e8a---gefomiweworodirajajer.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/1987634731.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/7b3e32e4273f1ecf5013e14d9faa77b3/17591198215.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/b0c475ae15862f251e4b4a51a866c42a/kewepudawalesiw.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083a2e1c685d---13201164053.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16119f20865412---filixewelekigonunuzaze.pdfIn PDF document text
    • http://juliesfundforkids.com/clients/d/d6/d6f17a7a4e9d342a12f8f8eeddb80b2d/File/wemuveporo.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_off0000e5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EC 17720 bytes
SHA-256: 1b3d7ae6c07da0f3b6335bcc564e230e7426628db52fd35971962327c847c5f4
font_01_sfnt_off0001141f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141F 11104 bytes
SHA-256: b67ba82dba69c2e7b7f5e927fa27c67740b2357b74bc3ac5b0d1975ed8aaa046
font_02_sfnt_off00012e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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