Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aeda77b2b7a266c…

MALICIOUS

PDF

92.3 KB Created: 2021-09-06 14:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2a0bc128af4852d1cdc8e226599e056a SHA-1: 62920dcb265c50ed59a35d9ce900528d531f5ad2 SHA-256: 3aeda77b2b7a266cd25eed173835ddf2a5f1bf74d289b66b8a6977307efe2273
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristic firings and URL analysis point to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://dancephoto.ru/userfiles/files/66694070250.pdf In PDF document text
    • https://birutelorasin.com/contents//files/dotufagafot.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/30205605325.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210815_07876FC1618EF756.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/joruni.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/1600c97b8805efdbfa312dbab93d2752/26792545868.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/raxifokitibusujeleso.pdfIn PDF document text
    • https://kamedia.vn/data/file/44355216400.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160af6a946201e---gobes.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceaab60ec3---69479047480.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160f75d442d868---fopadukojeg.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c650388c609---36804114804.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4e23a75847---pisedudirifim.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/jevikitelerifekumopowozid.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/3841a508927396a4cc1365b263cbb6f6/5011652780.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/viwewitasufata.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/mokapizomugisa.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/kejijodawatizapibeg.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084be1d27a0e---39346701470.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/791159845.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/siganoxixepiba.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/wolibarojef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=creative+sponsorship+proposal+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001044d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044D 10692 bytes
SHA-256: c8423f24ee2fc495d01af81cff0e7d93cadfdd64b6fd88508d6312328d77368f
font_01_sfnt_off00011cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC2 17972 bytes
SHA-256: 23e693198320af4f4fd8a5ba636e5854bb246abbc0431212a41de65f85539284
font_02_sfnt_off00014b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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