Malicious PDF — malware analysis report

Static analysis result for SHA-256 89aeac5ef4875f6d…

MALICIOUS

PDF

82.2 KB Created: 2021-09-13 12:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8db9bae1091b6b9c8151d05c57535aa4 SHA-1: 33e0bb5fc62ae46152c2135e669485c96399c3ef SHA-256: 89aeac5ef4875f6d72e32be9e0c36d08edf66eeaef050aac6a81f616cef09eba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable domains, suggesting a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly indicate a phishing or trojan payload. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's designed to lure users into clicking links that lead to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://partnermind.cz/images/files/87557095956.pdf In PDF document text
    • https://majubesar.com/contents/files/78777150411.pdfIn PDF document text
    • http://vititanon.com/user_img/files/xumanutusemutumad.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/gemomalavimuvaw.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/106f50f3898c3abc0be51367ab1a158a/99929557485.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/nomabitazujidijabirasapa.pdfIn PDF document text
    • http://herbexindia.com/ckfinder/userfiles/files/najub.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/28873371759.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/4838037683.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/57847189258.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/4rp67fkop9t1t879g1176bus85/kurira.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210907225951.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/datexozofowamigefugoduxij.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/78495308599.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/43507922419.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/89266158577.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/81042563343.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/duwuxesotidinegu.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1613208069c8f7---talifipuzifewalagi.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/lotojefopopet.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16135074a3f40e---dadiwi.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613710dae31c8---85752177545.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/55722878827.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=best+low+pc+emulatorPDF 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_off0000dc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC94 17940 bytes
SHA-256: 0d1083506b12331adff9e3a2842e95a6beb02619c202e9e5e660423647f5d6bc
font_01_sfnt_off00010b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B19 10576 bytes
SHA-256: c58a003a6a7fa20349504793f55a0ae5ea3ce8cc9c4fd12f69aefae41e129194
font_02_sfnt_off00012373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12373 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1