Malicious PDF — malware analysis report

Static analysis result for SHA-256 38928d853139df29…

MALICIOUS

PDF

85.0 KB Created: 2021-08-21 01:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eaffe8489e57d3297c5e12a1aead646c SHA-1: 3b8e16f91f965894a44a8248bb5e42df6a7554f1 SHA-256: 38928d853139df29aa8bfa755ea3705997e4ccd6f9f2db12ea57f37a1611fcf4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample contains embedded JavaScript, which is often used to execute malicious code or redirect users. The presence of numerous external URIs, many pointing to compromised CMS upload directories or disposable hosting, indicates a link farm designed to obscure the ultimate destination, likely a phishing page or malware download. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://smidgel.ru/uplcv?utm_term=condicionales+1+2+3+en+ingles+ejercicios+pdf PDF link annotation
    • https://rivieresoceanie.com/ckfinder/userfiles/files/vezixix.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/ea646f59d15232706e3a3a8d7af807ae/nogolevog.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/86717303378.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b896a88c2208e10e742f107af940923f/gewakonenobom.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/94583241019.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/138993f84101bc04ff2aedb260a079e2/19503602977.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/xoliketado.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/38932768404.pdfIn PDF document text
    • http://wmehoa.org/clients/d/df/dff1b85474dadb967ea0c40f6d5e37f8/File/91007536106.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b135a71082---42949641649.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/zuxuj.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870cdf54ef2---wiletuzebuzebevamu.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/novutejul.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d272281c99c---29214682142.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7c6ebfd11---33878328627.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/75087268931.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608fae1e37dbf---naxilavaliwizaxodevuveno.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbe17cd16d2---vorad.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/wokafivujuzagewivuwo.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/126ab3dcffae7efc43f702a971cc5e00/kekutujazafapin.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/rerezozu.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/81125412570.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_off0000e5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B7 11204 bytes
SHA-256: fb3d7d05c14c8f19bb92ce4514a8815713dbb6717ce61f2298758ab8ea71045a
font_01_sfnt_off0000fff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11803 17564 bytes
SHA-256: 58bb682f477573e2b1248bb96fa0e256135be1387c03ca6a9e4c9550615a42cd

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