Malicious PDF — malware analysis report

Static analysis result for SHA-256 b77a86a519f956b6…

MALICIOUS

PDF

90.3 KB Created: 2021-07-22 23:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 29f09cf1d395085f3e9b90537d710ed8 SHA-1: fffcf1afa886bd6e3ae0f7a0376d5b34011fa096 SHA-256: b77a86a519f956b6f239d7e0b2123dc87b6cdc516fbe0d077ae0db1d46ec8b55
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing lure. The document contains numerous links to external sites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to distribute payloads. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely provides instructions to decrypt a password-protected archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://antansconstructions.com/ckfinder/userfiles/files/verafogalijizawuradere.pdf In PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/416iaf3utf4f4uqcg4eg16ajit/laxifenufelese.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/libirema.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/xasevibulawiteboxateburiv.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/65291766072.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/tilevepodedugosebazu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b7061f382---xesagikemegoxoz.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/48925559822.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba16a7cd4f---jazuxali.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/g6kpr88d35r7il03u2f6k77cti/lazusixujakezemubefetosup.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/74103625079.pdfIn PDF document text
    • http://innotack.com/userfiles/files/64990080840.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/lekadibowapivudibiwetode.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/gefofoxovus.pdfIn PDF document text
    • http://itssilvertime.com/clients/2/24/24efe347a73a8ce028152bf895bc11a7/File/28801250658.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd939c81a8d---66728299207.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/xelezomubotukoxewosa.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/76789392952.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/542b2cd4c971b89963d1bbffb429df87/84642744233.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f36d9ab6c---dolemisawom.pdfIn PDF document text
    • https://medpressa.ru/files/file/jesafaxogix.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/kigatazesetobegug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=is+there+a+free+pdf+scanner+app+for+iphonePDF 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_off0000fbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001140e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140E 10624 bytes
SHA-256: b6ab74e3705e89c51ea279a54e9c22372bf29dafe6b1b568c68260de28b2f450
font_02_sfnt_off00012c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C44 18380 bytes
SHA-256: 8a6ff7ad82edf391b4fc4244c0d828242d6145e22beb59a7ea959b3afb875f89

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