Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c23d3ddc1e1a238…

MALICIOUS

PDF

80.9 KB Created: 2021-09-18 07:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b97e38a67306a9c39353f2a39cccf15d SHA-1: 62a4fe4bbcc08eeed178976eba0dfef1729fb144 SHA-256: 7c23d3ddc1e1a23833281e31be2e8df1bbdf142d1d5b21d0d250d258f9b9c6c6
164 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 an embedded JavaScript stream and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of JavaScript indicates potential for further malicious actions, such as downloading additional payloads or exploiting vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ahzycw.com/upload_fck/file/2021-9-18/20210918104304524631.pdf In PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/1ffcafc0a77beacf405343736cad590b/rigadiku.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/8272755033.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109151628052981.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/37219471742.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/46665778789.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/14354711190.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/mozilak.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/84581920877.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/rereta.pdfIn PDF document text
    • https://oldd.adventurenetbg.com/userfiles/file/81217409522.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132030e07d7f---jezosijupu.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/90718049662.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/puzuvidetekuge.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/14646172172.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/77559766906.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/dafulawegomakufawo.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161401d355d6ce---xotabamofovinovakoduj.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/mudadiroxuzikeretomoga.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/nimaxixajagivuravoxubut.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/jajime.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/76361604730.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161449e255fd7b---katigike.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210918063441.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=battery+charge+limit+without+rootPDF 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_off0000d5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F0 18044 bytes
SHA-256: 545630b2e443a953d4f4c9c60f9c263637c4a4c5208f939527c17f9777116874
font_01_sfnt_off000104f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D08 10756 bytes
SHA-256: ad1e33ef602f409bc9882ea9bbe42ad5dd1be031069685f4f0493ed0d51f5db5

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