Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfeca16066cf9c94…

MALICIOUS

PDF

77.5 KB Created: 2021-09-06 09:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8d4668ce084db2e541211b9b0e353e45 SHA-1: 22f3a9633b6a331e7bdb8e75eeada029aed9fbd8 SHA-256: dfeca16066cf9c94b143b46438dca8b9c53c9dfdebe606619aa5cbd6a95038a1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of JavaScript to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=2018+jaguar+f+pace+user+manual PDF link annotation
    • http://4998horo.gmmwireless.com/contents/files/sexiwebesakotadivowomo.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088948f1c778---5711027763.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb70e89a00---rawisina.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/xonerosojokunazozigon.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/89995951898.pdfIn PDF document text
    • http://weingut-suppan.at/files/xuzivotiwuxo.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16072594a9bab2---15346385090.pdfIn PDF document text
    • http://iwort.de/userfiles/file/96535203473.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/84653763881.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/904142441.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/moxeba.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160980cf88cafa---28386976557.pdfIn PDF document text
    • http://come2menorca.com/images/file/3858716277.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/zipumabodujud.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/42288843193.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ri9j8106b742uct7itun7sj2da/50440398699.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/6878468421.pdfIn PDF document text
    • http://888chji.com/userfiles/files/motoxatavedodevij.pdfIn PDF document text
    • https://emenu.hu/editor_up/ginorusefanufajefo.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/bivesevox.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/wogux.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/jexire.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/93095509324.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/4dc519448b8a2558ea4635a2dbbce884/96620647728.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_off0000c9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BF 17356 bytes
SHA-256: dd62e6f7820997af1f6f4d705a005a7493a86f07381f31a98d58f47f510045ec
font_01_sfnt_off0000f6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C9 11148 bytes
SHA-256: bbd473dd9ffcdb4822212159365b32e65288b1741983a570d8f077d6e53d46e3
font_02_sfnt_off000110f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1