Malicious PDF — malware analysis report

Static analysis result for SHA-256 1250634a8dc8ca75…

MALICIOUS

PDF

84.9 KB Created: 2021-09-12 01:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 35a274498451959977e4134dd003de12 SHA-1: c85dcbadb138c5b83d96604b348d8a12a44c0d67 SHA-256: 1250634a8dc8ca75beca8e18b33a4280ffa86555aa82f7d244a7606d2ee08062
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, many hosted on compromised CMS uploads or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristics and URLs point to a malicious link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://na3.it/misc/file/58095579963.pdf In PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6f2f54547---sodusuz.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/gisupijewedisugola.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/83jt3o7ce8vrfamcbre1903fs0/witevalisiparabidezuwora.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/vexabovalugakadiraruza.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/14600342375.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/59684834539.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/zarojoj.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/54463993366.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/64385124472.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/nibewejegutagolelibenag.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/28336190832.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/bivera.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f705e9ecf5---8103265617.pdfIn PDF document text
    • http://jycjqj.com/uploadfile/file///2021090612113542.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/33543988401.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/mowipexaxafenegolopiza.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/d8cdcd0eaeeb29f6b51525810b577a04/fedogilamukenor.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613173c874a07---77467797175.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/14213585479.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/74240003711.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1613321c801008---38627361539.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/78676529032.pdfIn PDF document text
    • http://snsi.jp/image/news_file/gogaroso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=jak+wgrac+android+na+telefonPDF 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_off0000e6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF00 17828 bytes
SHA-256: c4f77fdcc0fe43213c071b531ccf51b41824e3b1e676cf8afd7f8fc7c6a6d84b
font_02_sfnt_off00012dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC9 10652 bytes
SHA-256: 4707a9a49b2fe67edd3cabd35b722df3a8944fc5a2eba468a689ad0e438c0fe4

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