Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac4fa2515166553…

MALICIOUS

PDF

78.4 KB Created: 2021-09-06 05:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 66bf6e1c3c2468eb3471ba78855b2340 SHA-1: 73c32821bdbfef0ca6b5a54a949586db963672f6 SHA-256: fac4fa2515166553b66004cebce5a7c3eba575d0016c3cd107c229e779971680
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to various compromised websites, suggesting an attempt to distribute further malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • 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://sapporomn.com/userfiles/files/lavexidajowixomijix.pdf In PDF document text
    • http://www.firengo.com/userfiles/files/tesexetubibife.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/pepiwudoko.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/xofebufimixuj.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/46689267033.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1610d2e656af9b---61212433003.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16083dc886b143---48638792235.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/70e2cb333ebf3eda04b8c59aee5cd956/belugiguviku.pdfIn PDF document text
    • http://willbramephotography.com/47475660172.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160abdab725c17---raseza.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/c7gdl9sd5bosnjqq4hge4ckov2/dikejegavatelexogatozeg.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/mubuxijuxeviloga.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/43092080848.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/koson.pdfIn PDF document text
    • http://ttc-investco.com/img/files/81121655298.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/54167253048.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/079c0a1a07c850e7c0377aed8332b22b/11234719263.pdfIn PDF document text
    • http://sinostandards.net/upload/files/pebawejeresigumamoxitumo.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/67742022305.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/65138164612.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/nub6poi9fcghbkv6qhqr44tiqq/woputipasevixupegowijomej.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/q9c1dcocdaklbpkfqsbgposdhe/riworegufufikakezojeme.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/55780357668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=download+pdf+to+word+offline+converterPDF 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_off0000cec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC4 10596 bytes
SHA-256: c2cc19b41213d1db11f2e505829e418a9481040ad2e26223ff65658fd8ec8091
font_01_sfnt_off0000e715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE715 17248 bytes
SHA-256: ea6f7c14c34a30d0366dd6ede92e4b459f51da111ee4de8733a27afffeac0aff
font_02_sfnt_off000113d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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