Malicious PDF — malware analysis report

Static analysis result for SHA-256 f04ce540b91865e1…

MALICIOUS

PDF

112.4 KB Created: 2021-06-20 12:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 18d39c2dd6260fa852d4a107b5ce4f47 SHA-1: b7d41afeb7096d920c152168965465892ec62ca9 SHA-256: f04ce540b91865e100e783346396e9f9f2096f1185341e212dd1a4d8656fab33
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a link farm pointing to compromised CMS upload storage, suggesting an attempt to distribute further malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass security filters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://etonbio.com/newsLetters/images/file/titomijidejavigidazatefiw.pdf In PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/eb0a7c110e970c53170f6a4d842acace/zimezabesitemidoveredugo.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ns9lk6j1ataen90krkt9jmk675/59279400351.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160823c83b8a95---varurizexug.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/beliveneripiduwuxikasojud.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff563d6116---walibinetufefuf.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/qkfvc125c0feqrnilh10lrdajt/83641503674.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076b35d89089---22759077715.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/64aea83d70d31214e03949abba1c6a57/mogipebesepawejovulogewev.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/5528321493.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/julireni.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/gaguwodomuxoxuk.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0eed5d2610---9651128431.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/65131754631.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/86526232301.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a629b6487e1---81321622074.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=pokemon+revolution+online+poke+timePDF 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://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001329d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329D 5968 bytes
SHA-256: 7399992005aed3a708f2c9015bfe6a280a9ad7bfb39db9c1efd39cabf68bdf9a
font_01_sfnt_off00014646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14646 4704 bytes
SHA-256: 4ff3f318b88fa1e16513bd6ec0ead8301d7102790dad0334f75d06378f8121c7
font_02_sfnt_off00015632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15632 1936 bytes
SHA-256: cf50d13c5c21d2e34fba0d9dd21119d4839fc35fdaebfe62cbacf51850cc328d
font_03_sfnt_off00015f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F66 6668 bytes
SHA-256: 373fd5888a88515bc5b1d465f7e5d96c2a1250eb851f9c878878e7e33dc2bef2
font_04_sfnt_off0001712a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1712A 14388 bytes
SHA-256: fab93622d71f34f41b1927f8f1d93f3ef2ab94523c1ee033ea811ebd7a398c32
font_05_sfnt_off00019db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DB1 16276 bytes
SHA-256: e4dc33be2427ee29015a0d8237c92786c2f8bf94e751af327b631a7466dad300

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