Malicious PDF — malware analysis report

Static analysis result for SHA-256 473c025dd6f9c10f…

MALICIOUS

PDF

95.4 KB Created: 2021-09-01 11:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: aaf234f8174d128faaaa0e0f8c13e450 SHA-1: 4575a68cfb7b334adf4bc17b28d5f63fa1f0e1e8 SHA-256: 473c025dd6f9c10fb04f0dfa3ce89ac3460d86baeecc3792ac0e09efa0a0ba5a
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an MFA/2FA-themed lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://irlanc.ru/uplcv?utm_term=afk+arena+january+2021+codes PDF link annotation
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788ae097abe---18070427825.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f2167c15a2b7d324710219eb9272635d/gagedurelipip.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ff80962e581---95405836957.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/18254813326.pdfIn PDF document text
    • http://puppiesjust4u.com/clients/c/c8/c8a8d0e690f73854b1e7a5fbb9521f82/File/juvebulesifodijevunadata.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f1be4e20b---bixosazadefusonixazisevid.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/6e95593ff1ea5ce7743bb8e5eb73e2d5/10037444809.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/xerazowowo.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/sagigubizisamuwozifekuto.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/76def146217a71657334fc02727c25e7/zizexapuzenu.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/wulel.pdfIn PDF document text
    • http://inistor.com/ufiles/files/98239819013.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe40de0f7a---bodabudoleve.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736ff0b34d4---wutopopinuraj.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/kiluzisobogonugada.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/kewujimidiveporiz.pdfIn PDF document text
    • http://rideco.hu/upload/file/zofupoxevuwofirepulupoxar.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607808937d3b1---84793736491.pdfIn PDF document text
    • http://e-hematologica.com/users//file/pujixir.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160d4681da1918---sunofilixosowariveruf.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7049ca21bb---sebejel.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18ec28fb7a---mulugixitafulekizifagad.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/baxabemoxidimifaravuzip.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/a170ca0b891e78bcba6cae6fbad23d60/pivagepedupipujelew.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/0e29922031f59036e25d8c726525c1e5/57451756178.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_off00010dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBF 10944 bytes
SHA-256: 948b9f505fca972353be90da761e0e3e85736afec82157a9e554c1181027e715
font_01_sfnt_off00012763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12763 18880 bytes
SHA-256: 6390090208e9f7726253f19037b7aad22c1dfe58e0b93979e53258684ba35f15
font_02_sfnt_off0001580b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1580B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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