Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ba4860e7efb92d3…

MALICIOUS

PDF

100.0 KB Created: 2021-07-06 22:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4a9c7a844775402a748133ae91e78e0e SHA-1: f00c9aca8083cc878688829771f90bb242855ab8 SHA-256: 3ba4860e7efb92d3c78fd5a04359287c48c9c4f82cf1ff5118dec88777d7f956
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/e16a31b67ee9c5c4a0fff230eef481f4/67436156578.pdf In PDF document text
    • https://guineaservicesproviders.com/gsp/files/73893776580.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/44430229190.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e1bb146b03---90671179734.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f54c03fc2a---1475095919.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/60b3ea69f13bdb91b82c0f4415e16fab/24127706399.pdfIn PDF document text
    • http://geonatlife.es//ckfinder/userfiles/files/31786541290.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/1af6af97074da1b124e613bc01391a96/joxalane.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/3hamoo21p3u2a8tie0oldq06l5/pakewudokituvebufugisiz.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/45e06938cfa458f71ea2dcb7e0510b4f/71714916825.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac130bc32e---51383545942.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b07cc0b2c66---21854678318.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/3q5e747tqpk31asvpjlo3a0p1b/wewowozekanovet.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/titasibizowob.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/52243699755.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/a5acf0c3cd762d215a21af51d837a939/lixefejatalawipil.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f97123553c5bab04127b216effb2a42/91481040609.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/43717321661.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/dobametipibu.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a21f3e4ecd---kemumojagoxudonigozotojif.pdfIn PDF document text
    • http://lg-palette.com/upload/files/wajiramobazumodopav.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/4aa98d0b5e8ac3910b872eb33b4d1c41/99370861874.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=addition+story+problems+for+grade+1PDF 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_off00010c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C83 11128 bytes
SHA-256: 52c5e593ea70ee6015bd09a3696c025c9cc9eb44adaf7d2a31464c525ada0ab5
font_01_sfnt_off00012620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12620 16252 bytes
SHA-256: 6d568972154aa9e6553788066da68fe6d5b0b58db67a92e881fdc4c3770f4e1b
font_02_sfnt_off00013bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BEA 17752 bytes
SHA-256: be7a0d3d7927ad57e5d1dad9cd604f19bc19a9aaa7f96bc9b4cc79ca63dbf977
font_03_sfnt_off00016a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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