Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b5adbffe0cdcd39…

MALICIOUS

PDF

82.3 KB Created: 2021-09-14 04:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 430619bed3aa63af9564a7830ecd02c8 SHA-1: 196949d99ac74c57fd79b44f11a8b746661b5d6d SHA-256: 1b5adbffe0cdcd39e9c0fc8549c5818483f4fdc4878cf931375a75252453a044
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external sites, many of which are hosted on compromised or disposable domains, suggesting a link farm for phishing or malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade static analysis. While no scripts were explicitly extracted, the presence of PDF-specific heuristics and numerous embedded URLs points towards a malicious document, likely a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://jessie.vn/images/ckeditor/files/54353787425.pdf In PDF document text
    • http://xnucleus.com/members/member_images/files/9385274757.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/nexetavibufawaloxewiwu.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372e73389d7---38225945368.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/waxaxodezi.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/70929811959.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/sedumogula.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/11928749301.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/pomalapakimazotuzu.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/74608284473.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/22957162308.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/309231641.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/22703314928.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/nanibi.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/b842057bghv8322dufeflp1bpk/livapatoz.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/jokuvopagutuz.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/jewaki.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/9553088810.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/30148797195.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/migikuvoropuriboduvizera.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/cea3a1059adad9669e88d44e1f5b8131/65546690119.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/satuvojapaxiwefek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=password+of+zarchiverPDF 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_off0000d9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B7 19072 bytes
SHA-256: daeddba3e70423a9c6a702d4de2a30ee232c69b53a7e1f6f651494c3e2bcb9b2
font_02_sfnt_off0001236d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236D 10540 bytes
SHA-256: f24bbb39fcd41d792c688014b4d46815aaca132644f8fad5e6847df42996f817

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