Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d6e2a963fdca91…

MALICIOUS

PDF

83.2 KB Created: 2021-09-05 13:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 59a0ac6b056c3d3e308c966563a068f6 SHA-1: 5c292d72e7260c68578add01588657198044089e SHA-256: b8d6e2a963fdca919aa9b9b90850ec1c3df4a7bddc364e164eca04809b980d35
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing an embedded JavaScript stream, which is a common technique for delivering malicious content. The PDF also features a large number of external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to phish or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=solving+quadratic+equations+worksheet+quadratic+formula PDF link annotation
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles//files/sajezapokomi.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/j4g1j3o1m503ikh6ftindral9t/89055665207.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130da18d08f0---18168974017.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/91632923406.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/24ccf07f840ce7ddf15d2e64685ab0a0/12141367035.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/98892264296.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/tusiso.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/46182321941.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/32c2a5f61df9dbf5ded7fff2d2a868ac/kulaf.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/lavulatemugi.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/samurutin.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/8d92db48e0b95029877147b6c46892fc/merotig.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/31599453704.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610aab447a3c8---xidavexifuwak.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/84448076671.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/77207609987.pdfIn PDF document text
    • http://industrialdevices.in/uploads/42110205010.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/faruxokolotivuki.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/634893cf8c6ee5321e4e2f2514db1b1d/85330341495.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/kubafi.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4e1f72289---gitobejunawavas.pdfIn PDF document text
    • http://truthtube.com/UserFiles/file/mowujubaf.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607029010b8b3---1356743239.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1608b01c719cfc---96243586938.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_off0000dad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD7 11488 bytes
SHA-256: f073bcd69338f0f68ed59fe2a347b85716bac12310ffcdd402754bc32692b8ac
font_01_sfnt_off0000f55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55E 18740 bytes
SHA-256: d11395665e49c874b888fc89e26c286e4dc6f065b22a407d0fbf1707c123a45a
font_02_sfnt_off00012648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12648 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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