Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc9bbd1028d7965…

MALICIOUS

PDF

76.8 KB Created: 2021-09-04 21:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 54ee8156c50adc656bb44cfd049c588e SHA-1: 97ac7396f5bffe53f0544e65fe2e5a5fe0ef121c SHA-256: acc9bbd1028d79654afd38f1a453b571323b2506b27c806a4dd910d049fca38b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, but the heuristics indicate a pattern of SEO-based link farming.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://robertfeinberglaw.com/images/edit_images/file/75536766738.pdf In PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608828b752697---96307447946.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/26ccc6a2bd9a59816bd0f3cf7b99c3f6/86085861812.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/suroluronolukipolajegemi.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/zejejakujupifawapomej.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16090d2e6cda99---45836556235.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16103bde1595d7---76228379648.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210822061424.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/a14c7f16da9886d59851e44054614c3d/63652306741.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/folewowul.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/69536853611.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/rugifawomupabolakabi.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/e62a53502e8508f6d07fc52a4ebcff38/wodeluveti.pdfIn PDF document text
    • https://5uempat.com/contents//files/83364922482.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/89946176108.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c4338286d---ropigaxerogujube.pdfIn PDF document text
    • http://crm333.com/documentos/file/gasowodalaziw.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160875747820f5---8937167232.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/84067731044.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/69461011190.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/mapidigonuseforerutatizuj.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/72866142851.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/e4f52a1b095df9d8b70b3df8959081c7/79925723411.pdfIn PDF document text
    • http://guyfamilyreunion.com/clients/41950/File/93632417315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=pierre+garnier+malet+pdfPDF 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_off0000c69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC69C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000deae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAE 18208 bytes
SHA-256: 2e126567805876355005ccde053c151dc7d3b2aacfc274c84afc837ce27d6770
font_02_sfnt_off00010dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD0 10552 bytes
SHA-256: 553269e79026438ea43b7161a0a49c6aa42088ade40a76bf3c2614d2ccd78b54

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