Malicious PDF — malware analysis report

Static analysis result for SHA-256 32a2cd8fe0384154…

MALICIOUS

PDF

70.4 KB Created: 2021-09-02 00:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a6f0ec556908f23c8a15c745e12a1092 SHA-1: 845651aaf4a8c345b8b25fbe7c59e29c4b3f54b2 SHA-256: 32a2cd8fe0384154d09d8146d18b0b568a532c8bdd3cc406041fef8e3ab4a4b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm or redirection mechanism to phishing or malware sites. The presence of embedded URLs and the nature of the heuristics strongly suggest it is used for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=confirmation+sponsor+letter+example PDF link annotation
    • http://ceramvetro.net/userfiles/file/36597722042.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/wuworogafexaw.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aab05f900c3---xuvawumozanipiretuvafeta.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/ligowexidupukajo.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///levepixozomuxeledi.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/nunoxozikilufufudorirut.pdfIn PDF document text
    • http://ehhs1969.com/clients/6/67/67a0fa02f482ea8575b7cec7429e43a8/File/67981132413.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609441d61fe90---59480873562.pdfIn PDF document text
    • https://linker.tw/files/96707911623.pdfIn PDF document text
    • http://trevorhannant.com/12831757705.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/43751957594.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/48f6997719d0461a19d1cf10e90d3744/nuliwaven.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/varibapugutijuxozefexixaz.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607171828b407---rikijodedutaxizunovitafa.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/5571068369.pdfIn PDF document text
    • http://jerilyndavisrobison.com/clients/870655/File/90542338760.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/88752815782.pdfIn PDF document text
    • http://sieuthibds.net/images/files/60502056493.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a57a70af69---podupojemo.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/vogipumoxiz.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/d7nt774gglthbmfru389e4ddi3/bitekediwovopejo.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/82892356153.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/nikivokejodavuluj.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/bf4782827508f3a5ca677beac5bc31d4/1907374568.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_off0000b4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B1 15212 bytes
SHA-256: 8d5bd78e5a0e0726dd57d5eacc829f11f1262e197fff6b2c343efdc91e38fc2e
font_01_sfnt_off0000dbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C7 10652 bytes
SHA-256: 00af3ac429d4319518864ea09942de848fd42b786d3f5cde559c4255a23e6fb9

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