Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e63691f3252bc66…

MALICIOUS

PDF

81.6 KB Created: 2021-09-11 12:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 477e09b497b42c97efd78cf833f4146f SHA-1: 5a940ff5112eec32e89cb6ccf0b425562abd68b2 SHA-256: 9e63691f3252bc663c930a3745128bf839160c1f77823566b329cd4a48da9b6e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to distribute malware. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass security filters. While no scripts were directly extracted, the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://synerhu.ru/uplcv?utm_term=programa+para+baixar+filmes+para+android PDF link annotation
    • http://candientushinko.com/images/file/zebotaxewonilukekan.pdfIn PDF document text
    • https://mkontroll.hu/File/zubavewaputonufamazuxode.pdfIn PDF document text
    • https://superpart.com/files/lozazoravewegaxor.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/0569035973.pdfIn PDF document text
    • http://didula.ru/img/file/xofokigadiwixapijoti.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16133acc8808bc---devovibejajese.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/53341415563.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/39488925053.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gulap.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/boxikorubixowadolofajuja.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16138da367a80f---futezufux.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/75875613837.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137ded307f30---voteguvodogowijubekamu.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/72300157596.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/21118018561.pdfIn PDF document text
    • http://tzsunup.com/upload/26969712635.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/74127990236.pdfIn PDF document text
    • http://mdtrend.hu/files/file/83878717278.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/kadepigivilewatatabomije.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/32656047559.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/8589c9368fe8330d4cae2bc54a0dfbb4/86381648515.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/46333325229.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/sonibemiwunedera.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_off0000d477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD477 10988 bytes
SHA-256: cc01d315f255e247a42e6e698b7018041240a1dba09e5c0613d81e47ee832fa3
font_01_sfnt_off0000ed83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED83 19852 bytes
SHA-256: 8c88f8cd68841e6ed9a436104183b9b9b0915da247f5af73aadc8d4277aaad84
font_02_sfnt_off00011ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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