Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d415db49052d243…

MALICIOUS

PDF

83.7 KB Created: 2021-09-18 02:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4789270fa0c5b692db4359294d047d64 SHA-1: feb86f7a18574353780200ac8814693c95309805 SHA-256: 7d415db49052d2435c70fd362c6ea8c8a445e5175d8fff771927ccf764ddf3ec
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm characteristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://allytemp.ru/uplcv?utm_term=gunship+battle+mode PDF link annotation
    • http://flemingdecal.com/uploads/assets/file/85994389400.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/sutomatag.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/76626776925.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/zuweguwu.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/sasuparogarix.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/e93cdf8cd2753797767b5307f3a2fccf/ketefigipurinuxe.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/bajazuzajewawepupes.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c93e004a8---vipivatiga.pdfIn PDF document text
    • http://balalajka.nu/media/jaxuvotevizas.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/zawowenavo.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/govavubovamuboxezedujulum.pdfIn PDF document text
    • https://phukienbep.net/media/files/sajebin.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/96eb30545bd51477bacf7f23cd04042e/91124617355.pdfIn PDF document text
    • http://bociany.sk/media/file/gopepibobuloxutagowaxom.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/96128346497.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/nonotadozikumux.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109120410159738.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/53502511979.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/45055378813.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/ofartsarog9i7t3r271ssv1rls/72036805824.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/7776003141.pdfIn PDF document text
    • http://eternoohydro.com/d/files/zinidagogosava.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/bbfa5e6419aee9646c7bd62e0257d4b8/fotalebo.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/zekemivutesifukiridajusi.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_off0000e268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE268 10836 bytes
SHA-256: b90bb8c4ee2e662da85ba40503357fde259774c8fff8d836c2112da660e052e6
font_01_sfnt_off0000fafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001130d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130D 17776 bytes
SHA-256: 3efadba8289e50c59e1a73c378e81a59168f119f9e3fd8443ac711f27a30a842

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