Malicious PDF — malware analysis report

Static analysis result for SHA-256 27789619c9a907f4…

MALICIOUS

PDF

74.6 KB Created: 2021-09-18 07:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01c60e35dd1d44b756545f69ec11e20b SHA-1: c536c69d61e0f23d10f7cde238b6e0f334b3687a SHA-256: 27789619c9a907f4fbe0b02d008e412398675a4837af695e4cd4f97a00ac5ad9
216 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan attempt. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent is to solicit sensitive recovery information. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggest a phishing campaign designed to lead users to malicious sites. No scripts were extracted from this sample, but the overall pattern strongly suggests a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://archism.ru/uplcv?utm_term=pkcs12+file+android PDF link annotation
    • http://ideatity.com/ckfinder/userfiles/files/1846787436.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/57588699504.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/sapukawamuzijeremoka.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/e7006f412a00287598b5d19285d59337/rajanudugexexefid.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/laduxivod.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/54980878005.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/08189fd5784ffee5624474b9a86bb9bb/51791496101.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16135f53f8ddb3---38588126202.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/45436417909.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/rupajivowozo.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/34743015925.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/besofeririwalonulola.pdfIn PDF document text
    • http://ping-property.com/user_img/files/96380063062.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/javujedat.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/tujitinu.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/84393777734.pdfIn PDF document text
    • http://dges.in/userfiles/file/25924276430.pdfIn PDF document text
    • https://bfull.ru/uploads/files/41556356115.pdfIn PDF document text
    • http://client.diffuse.info/files/dusexunalatamideripajexa.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/67237188485.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/b48538998b5036001a85eccc544be5f3/8204995232.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/gidosomalipe.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_off0000bfd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E2 17188 bytes
SHA-256: 8f54d1423e64ec6e866ea389fb7834a2b4289401f056248ec9dbd008778bc1a5
font_02_sfnt_off0001042c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042C 10636 bytes
SHA-256: 705008b1e489165f91b4e5bf0fcc7e3f389784f6081f607dcb6618966429f6ad

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