Malicious PDF — malware analysis report

Static analysis result for SHA-256 252bb2e3dda0c83e…

MALICIOUS

PDF

84.3 KB Created: 2021-09-19 18:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 52503a1267509cf8971f3c9c7c90147d SHA-1: 72b02ae9f08edd84affb0eca295535b67f537964 SHA-256: 252bb2e3dda0c83ebac044eafe4d784727f51eac71ea5432ce89160afe134e33
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1071.001 Web Protocols

The PDF contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm for phishing or malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely provides instructions to decrypt a password-protected archive, a common tactic to evade gateway scanning. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://pistant.ru/uplcv?utm_term=ghachar+ghochar+free+download PDF link annotation
    • https://baatco.com/ckfinder/userfiles/files/kopez.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614455e05d947---tevejozomajonasuvamorewe.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/53104053709.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/45423912819.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/nerirat.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/46080713334.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/varodesokuvobudub.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140e6151b96c---relovatifevifid.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/soralemope.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/29623595937.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b809156ab---waxuwigelazozowiwuf.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/58901955759.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/giwupakajoteluberofeva.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/48031668152.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/2927263036.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/xibamobaluret.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/kewedanomuse.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/xijukibemawipar.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/805resr3pak3i4ck02pd6atm21/xifenarijitudelewopowi.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_off0000e3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EE 18300 bytes
SHA-256: 5dd62520c40d30cfcb50e4b63c31f650088ad529f5e697b3d54379e2abfb8b1e
font_01_sfnt_off00011456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11456 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6D 10520 bytes
SHA-256: fc3b0690464cc2ea245419d79bc328390a383d4e574e01a7172a43b17849ad7d

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