Malicious PDF — malware analysis report

Static analysis result for SHA-256 a228033aed48cc3f…

MALICIOUS

PDF

74.2 KB Created: 2021-09-06 22:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8ea4abd5215c0bacef84bd799fc5f00d SHA-1: 79f5b5df628288e651801e8e1a324cfa95fd9336 SHA-256: a228033aed48cc3ffead5da0123eacc0664ee127407296ad1a58a1ac3b019e99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on compromised or disposable domains, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is unreadable, but the heuristic firings point to a malicious link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://srividyaastrology.com/userfiles/file/pezigowiz.pdf In PDF document text
    • http://luberoff.com/userfiles/file/revujuwupufetazavujadew.pdfIn PDF document text
    • https://ebooksweb.net/files/file/59829546306.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16125fa17a9f56---24664365767.pdfIn PDF document text
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/75a9750e46234pgrgdoauup9d9/toledukupitoj.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2e031280c---21332475816.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios//files/wizobunefidat.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/xafakorerila.pdfIn PDF document text
    • http://agrion.org/upload/fichier/77219258945.pdfIn PDF document text
    • http://nemochem.cn/upload/files/56664380902.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/24053311401.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9661fd81e0---gisixomedidomole.pdfIn PDF document text
    • http://ore-processing.ru/d/files/josanituxofo.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/i92hf4qcd5dqic0nsv03m0qobe/juxataparowovag.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/denijabazodimuxinokerej.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c53016bb430---28804569679.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/xajigusedivebataxod.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717f3e43b80---1904262336.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160cab4b36c45a---28204531384.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c70c23b7ace---momirovibukugumawugam.pdfIn PDF document text
    • http://minerva-collection.net/files/files/fumoxulakulegalujufire.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/2601242781.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=dell+precision+m6700+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_off0000bf4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD766 10880 bytes
SHA-256: 1fa0d5ae9c0431fa53e3b50ae1c0d1aac12f47e18b8069573a1533b2b4adac56
font_02_sfnt_off0000f087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF087 16348 bytes
SHA-256: 4c6f214a5780f59b6704765f7d92c97dc0abeddeef3ea90b237d036e0b42f681

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