Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7542df2106f8a6e…

MALICIOUS

PDF

70.5 KB Created: 2021-09-06 21:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 85d18a57fa4e481f9625bc94cd54254f SHA-1: 96b6bcace85fd99c9d001e4d9c6b010d94a48dd0 SHA-256: f7542df2106f8a6e72fca0131cb616cfc35cdc68d544661b024dea9ec11b0572
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for executing the malicious payload or redirecting the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://cainghienbinhduong.com/uploads/userfiles/file/43523892407.pdf In PDF document text
    • http://www.emailposte.com/pictures/gadekisevaz.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/26e57641c983a5179f4068c3260671be/panufewudinaw.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/rejovitadoj.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612e063018b65---53521063759.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/zojowemob.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae729f558a9---kilavexenolasuvi.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/lufavibamaxubiv.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/7659053463.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/rakejuvupiviziboniburise.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/femik.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/93295343618.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210829220940.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/31663052389.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/nusevemukawawi.pdfIn PDF document text
    • http://lawyerstitleescrow.com/clients/9/9b/9b7cfcecb5e5abb6b877b2b1d59b4eb1/File/nujemapakijutafedikowisub.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/3276693127.pdfIn PDF document text
    • https://actor-conseil.com/files/file/rolazu.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/73068554589.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/89017743688.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/zoxed.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/fimusopefuriladanipej.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613104aa0c2ac---12640754379.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/1h8q28i4in7ti0ficvn4g7ba6n/35492629426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=biology+miller+and+levine+pdf+chapter+2PDF 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_off0000b31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31D 11252 bytes
SHA-256: 901b3cc1b92b2217a5fabef8e922bd17d7c51b63cbbdb4f1d008b1b63ab3a2ac
font_01_sfnt_off0000cd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD26 15460 bytes
SHA-256: d1bd147179b244046a058c226317601cda55a2f51ea9a5a1f829e55cc91175ca
font_02_sfnt_off0000f433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF433 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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