Malicious PDF — malware analysis report

Static analysis result for SHA-256 9629ce1e92608740…

MALICIOUS

PDF

84.2 KB Created: 2021-09-01 02:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 70375d56c969b17a23fd702b1e2a3487 SHA-1: 5f2e8c65311e9f189fe269056af4b014809e435d SHA-256: 9629ce1e92608740aa7da076b5cb7de5736067b6a072e8183f28c34a72c26e40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://coretry.ru/uplcv?utm_term=our+dining+place PDF link annotation
    • http://gancza.pl/userfiles/file/78527185103.pdfIn PDF document text
    • http://faradbox.pl/files/file/tixanupixukamosomiwuson.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/97595627290.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bf856c58d---lisenuwa.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/vilam.pdfIn PDF document text
    • http://hopsch.de/uploads/file/wezefo.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/306ef5161c856e96e0f0c70d5d386282/gilizupadirugoja.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/13341646273.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/7a7bc78b1ad000d2016e6972791eac86/sufewojotikovumobawe.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/33738952993.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/jexuvujututukinivevutujid.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/190c5c1a8eb908341eddf1eb5955ea17/ganixafawilotemuvodawanok.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d442ad9356b---xivimususoxazojupofuwo.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/tupuvuzozijaguwiko.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/37763862245.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/f3d5a3f0bc70f10dddfccb52e0e80d0a/falinutopasulamavujetibag.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/dikavulego.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///xasodonogunuvafisase.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/a0a45f4168148c3d0a3b0af0ff830afa/19370961341.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/zekumokegekap.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fce72a518b7---vokumibixizuwoj.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/ketewunumubivixepujegipib.pdfIn PDF document text
    • http://cochu.net/resimler/files/bejabojoruwuxebufegafo.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/dizafusodev.pdfIn PDF document text
    • http://halmar.info/userfiles/file/23166671459.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e2607a027---55967352306.pdfIn PDF document text
    • 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_off0000e51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51D 17968 bytes
SHA-256: 92d9a7912f8d8491a6ac13e341e1e8d4a08f09b86cc4490fe8b24864150d7faf
font_01_sfnt_off000113a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBF 10428 bytes
SHA-256: 6d31cf58ce7a56fd4d55eaa822821267d567ab6371597f0ce891817e609a96da

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