Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a4e158271bb4e8…

MALICIOUS

PDF

95.9 KB Created: 2021-08-21 07:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 10ca9d9863d3d9aa93bf013da59bbf20 SHA-1: d4427b6c16ccdb37f367b5462770b445d39c6e4b SHA-256: e5a4e158271bb4e834faed7da05158ed5356a70e65468a13b150bc4818f2eb4c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains a link farm pointing to multiple URLs, many of which are hosted on compromised CMS upload directories. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common tactic to evade gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/2a90f5d8a805b57ac5bef0c2e9078c0c/95015831309.pdf In PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/377c653b12d41fc73814745a12b6bd5c/vaxenuw.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/7675416409.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6aaad9b10---62709921293.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/fepudivuzi.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/65979894935.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/pasisemijafopavomunu.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/fakoniku.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/70339205351.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/gs36aullpmkgkobucquutc8mgj/11789291957.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/60151271573.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ba8418087---wesibagan.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4eaf805d0.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/fozegodiguzavagavejisaluw.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/dc8dfa35ef8e4b8e4a26599141d25fc8/bakub.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/84196754599.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cfb7a1f44---dutizizosexavavagavero.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/44368621919.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/sasodibizulujomak.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/8aa4495d458e770620558c2c11326b90/39149622534.pdfIn PDF document text
    • http://haki.vn/uploads/files/kafatub.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/29311411847.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/26a281db6c798e9dba43023863e07be0/xosukigi.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/39799855324.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/23eec2a8c81af7d8be3fb4776a9868e9/nireparukoviva.pdfIn PDF document text
    • https://bytlly.com/1i2cjeIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=fundamentos+de+fisica+serway+descargar+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03D 11196 bytes
SHA-256: b991c82ffacc9f9a9fc7fe91b087673999aa51dba9f2b4053284bdf2eb07e51e
font_01_sfnt_off00010a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4D 21236 bytes
SHA-256: 044c20e273b6687a4f4ada27391d752181885df53528008f5ce7433d161384b5
font_02_sfnt_off00013f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001576d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1576D 16556 bytes
SHA-256: c3f01c8ff0a60b2d7f9b0c94e4eedf82fcb475789278f05763e982f3b026fd5a

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