Malicious PDF — malware analysis report

Static analysis result for SHA-256 e61258e8e03df6e0…

MALICIOUS

PDF

75.3 KB Created: 2021-09-15 23:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8bad81d47b45f9356173227c4055a0df SHA-1: 73d140bba9623d26c3643d645519513c1dd6c758 SHA-256: e61258e8e03df6e03eb7ccb7a41193b8f268a854d6a5820a47b862cc6142d0b3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'utm_term' parameter in one URL indicates a potential tracking mechanism for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://laborke.ru/uplcv?utm_term=mario+kart+emulator+android PDF link annotation
    • http://nhatnamvina.vn/rich_editor/file/96942011780.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///72432745070.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/tiwukoxezaxetelemamafela.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-9-13/20210913181824819774.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/22301505543.pdfIn PDF document text
    • https://lamthong-marchph.com/piceditor/file/64523320696.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/rubaferutasibejeriwovan.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/13683942740.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/55e19d6c8f3004a15df179abedc775be/lokifewanunamepe.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/gajimadowazazinaxufeto.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/32769948310.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/soziwi.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/potatagokavigupemikape.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/17347712226.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/63124707795.pdfIn PDF document text
    • https://alpinashop.bg/files/mavevolugev.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/33240098252.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/95060274911.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/fekamonanilagotibalo.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/nosusipitowaliti.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614006f224ef2---durad.pdfIn PDF document text
    • http://zgic.ru/!upload/files/55926501469.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210914010346.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/60343017421.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614029911a013---23044722333.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/2249722251.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/76797029812.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_off0000c529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC529 10424 bytes
SHA-256: 5f3be6f3a84510b857e4337fa24aa3f51fe793daeabfff0da51cd67f7e1e8343
font_01_sfnt_off0000dcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB9 16676 bytes
SHA-256: 1307ea26976eb8d0b04540fe8a66ba5f0e499a826257ff73b3d24592e4f79b03
font_02_sfnt_off00010797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10797 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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