Malicious PDF — malware analysis report

Static analysis result for SHA-256 02f68053b0e7018e…

MALICIOUS

PDF

68.1 KB Created: 2021-10-02 21:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 374e916034c0ebcc13001ab72ae7f12d SHA-1: 65c686afaaae1aa656481d67aaa2eaf33b934e5c SHA-256: 02f68053b0e7018ea903b97c03e89b9aefafa723ed9e6e950f8f56555a2834d6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous URLs pointing to compromised websites and disposable hosting, suggesting it's designed to redirect users to malicious content or download further payloads. The PDF structure itself appears to be a link farm, a common tactic for phishing and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • 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://allytemp.ru/uplcv?utm_term=pyrimidines+in+dna PDF link annotation
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/f81de0f40abbadd26d549e16486445b9/puser.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/2021941819451507.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613637d2cf9e5---wuronexozinipafijenobob.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/bininunizexitokeroke.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bed63bdec---98930767438.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/30447386729.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/gizoti.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153a8fcd9dd3---buziwes.pdfIn PDF document text
    • https://digireg.lu/upload/97129236173.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161533cea9af38---weparuxelixuxoniberizule.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/58372696048.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/61104653437.pdfIn PDF document text
    • https://mikludava.lt/images/files/72350583049.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/wubobowumofifenexixu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e824d76341---86695782979.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/51891339958.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1630670404.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/90561303761.pdfIn PDF document text
    • http://ssp.by/var/upload/81031281341.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/78148692918.pdfIn PDF document text
    • http://inistor.com/ufiles/files/13918226887.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/suwopelavo.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/dagujiwazijupabivojesa.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_off0000ae66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE66 10260 bytes
SHA-256: 3d6a767110bae50af5b73d031da77cf13a91214e1279aad72b0803568494dd0b
font_01_sfnt_off0000c562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC562 14924 bytes
SHA-256: 0d75ae114720bd678eeaf0344d655f8ce33b18476d26496994f9a6d4aadc262f
font_02_sfnt_off0000eb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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