Malicious PDF — malware analysis report

Static analysis result for SHA-256 39b678f5566766c4…

MALICIOUS

PDF

92.3 KB Created: 2021-09-06 14:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ff9d59847752e843f475748afe4d2652 SHA-1: 7fd6696bbb04880f03bf7388a4cc21362a58bd5e SHA-256: 39b678f5566766c4ff7620d85fbbdc16f6843f4534846aa009f19624c06ef6f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but reinforcing the malicious nature indicated by the heuristics and URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://rosewoodcity.org/nbloom/fckuploads/file/fifunit.pdf In PDF document text
    • http://mardeestilos.es/fotos/file/gadelelomofepireku.pdfIn PDF document text
    • https://5uempat.com/contents//files/miwisut.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6e80f40df---15910281933.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/rafinemufofineroparu.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/nonodetelubaramuzafax.pdfIn PDF document text
    • http://japhina.com/upload/file/66144191977.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/gurutetona.pdfIn PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210613203330.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c174d292255---35414404276.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bc4cbf286---84057826188.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f5b72060e9f---kafekasivu.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/14416891420.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16099b81dc9621---31849172217.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c556fde57d7---kerumudiku.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/sokugajobagisa.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/1e39dc96320ff09a9bd16a737e5776b3/witerukitoriti.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/19495698696.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ab743a93c---80579290928.pdfIn PDF document text
    • http://venturahigh1967.com/clients/40640/File/xazijenasawufexi.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/098a0dbf1c0c5a589843a9240dd5f52c/80667996839.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c13a8c699d6---35826931145.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/9573799691.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/wumesukewijuveviwop.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/0d7ec1c063460dd719af402ebd26a32b/kabesirufegokakokotexo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=honda+foreman+rubicon+service+manualPDF 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://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_off00010207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10207 10836 bytes
SHA-256: 7b3d4b848fa22fc361dfd00a7a1a547717d5a12e7e4d55cb81a3443ae452028c
font_01_sfnt_off00011af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13308 18588 bytes
SHA-256: dc435730200e2ed03cf4101c3d130fe6945876ac956aba935f54f9162f24e15d

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