Malicious PDF — malware analysis report

Static analysis result for SHA-256 85edd724853d288f…

MALICIOUS

PDF

135.0 KB Created: 2021-09-11 15:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 12413b5838db2a1cd76de364ca13e345 SHA-1: 874133c371fd53ed1182fa65fb139605574a32e6 SHA-256: 85edd724853d288f96e7617b10c137f28064aa4a6736b6346f40974dfd025545
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=baloon+tower+defence+4 PDF link annotation
    • http://fobas.cz/userfiles/file/98456444831.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139852b05f07---wejabujife.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/xekonokokumipoxidepawipuv.pdfIn PDF document text
    • http://tdbm.vn/upload/files/jisaxefu.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/82195433785.pdfIn PDF document text
    • http://laserinnsbruck.com/static/gigokudolidakaf.pdfIn PDF document text
    • http://ahknchem.com/upload/files/21975201261.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/74435414469.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/28846141873.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/48284987565.pdfIn PDF document text
    • https://langumeistras.lt/i/File/sanebebofigidazolidunug.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/pesuvexutusokekeg.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/9631237967.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613552c8e138b---10199440906.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/77822512685.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/5524349466.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/bomitowuj.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/sulesajokorofudikew.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/62776450092.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/b14a079c06e7013bbf916ccbf6c5a0e9/98721630015.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/79912497249.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312e084792f---ganamotilomamiwewuv.pdfIn PDF document text
    • http://mextro.de/upload/files/70488585435.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210901_092258.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_off0001ab19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001c330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C330 10424 bytes
SHA-256: b0ccfed0396b2c0d6d24b0ddcd90c43595bc5ef9b09a77d57a2889c1f8b874a0
font_02_sfnt_off0001db15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB15 19596 bytes
SHA-256: 575e39141515c8659bca2101cd7114ff0b031acb39a02299c0b57f08e708c8aa

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