Malicious PDF — malware analysis report

Static analysis result for SHA-256 eed82664e7bb9079…

MALICIOUS

PDF

86.2 KB Created: 2021-09-06 23:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c7df0856d076c8ff34615b8f88971d36 SHA-1: 3e72d9d9951d8ff4b0b24a704b0b399f02d12737 SHA-256: eed82664e7bb90796133f4c724648c6ba73e01b9200773fb5fb2ba7d07549271
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of multiple external URIs and compromised CMS upload links strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=cazadores+de+sombras+2+pdf PDF link annotation
    • http://eaas-journal.org/survey/userfiles/files/genokexezaw.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9b4eb4fb7---16573160851.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/pizategup.pdfIn PDF document text
    • https://area5srl.it/file/49476941305.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae2acd11c5---sunenafesiguzivuto.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/ziwimesoseratikun.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/feruvutawokurawu.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/46438466017.pdfIn PDF document text
    • http://bhandarisurgical.com/ckfinder/userfiles/files/fifoked.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/kuvezin.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2a17d2f84---40676968810.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/28749a09bc575ec941741f932e59a711/naxegadusudepekuxifuzimi.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c85ae2dcc---parodo.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b5e8bd758---nonejajudugedepuvujis.pdfIn PDF document text
    • http://vhktn.at/images/content/files/manadatogubupafuxabexedo.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/8cbb900db23eccbb9eed2b4281d68544/84721109017.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e585aea17b4---dusodalata.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/forinotexopodowuxupuvo.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/94365218091.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/73559128429.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/5fhtvappt7i8i45sev98jsdj2a/2905967670.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_off0000e961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE961 10668 bytes
SHA-256: a70676ec2c8395422a4cd71d82b970011a78bf781f12d0ec3a2143d2053f08d3
font_01_sfnt_off000101b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C7 19440 bytes
SHA-256: c1672dd01abda2be622ae4b97862a042faf402b293baff435a5bf849bcf5570a

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