Malicious PDF — malware analysis report

Static analysis result for SHA-256 70053320c84997d2…

MALICIOUS

PDF

101.8 KB Created: 2021-07-21 14:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 76f5d048fe203a09c19454df4df70a48 SHA-1: f06e35389ce7efd995d77aa409aa8560788d4ee8 SHA-256: 70053320c84997d2332366c841774f1cab11da62310fd473e5f3f03222944fa5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://khangle.vn/uploads/images/files/76953331010.pdf In PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/434379f9138aec0e01f93b147f23806d/ximebelixulobufutuvugo.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/0d84cb1f556a19f8f667440609991775/wopunoberuz.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/1018187205.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/8959c74539b9e2f2a245e311744e2b70/37596429465.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/26817280023.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/bosikerizakevapazul.pdfIn PDF document text
    • http://vo23.ru/upload/file/poxigizajerolivenil.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/mivojarogig.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bba7037f8---60116929059.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/viwefagenulodajek.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/gupowiju.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/tsblrhhhassfmebjudp29chdm5/kumorotiba.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/18478428075.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/nilileboburafi.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072051b6da2b---kafofojipaxobotomovaso.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/99913865229.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e452d3b0d93---60026742036.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/numenizawobejapevexog.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/7878e0364d3a3e2b414cef198e67900f/fesutalebenunixul.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/11513037030.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/44198369526.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=why+do+you+want+to+be+a+police+officer+interview+answerPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4B 1788 bytes
SHA-256: d8d12bcbcfd4039e03e7baba9b9898496b4f805730582ee245f282c690dce54c
font_01_sfnt_off000125b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B8 19600 bytes
SHA-256: e856316d5df7bb4649caf7b9b90ad97bcddcac4e659fa553541b93337daf5f82
font_02_sfnt_off000155eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E02 11216 bytes
SHA-256: 9edae4fb102f2d3a9fd79dcd9064e8e8e8de33bfddbdc6ca3cf11801ced4d886

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