Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e4fb31a1552bd8…

MALICIOUS

PDF

91.4 KB Created: 2021-09-02 05:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 764654aeb6e76246ddf9ec83c3bb3075 SHA-1: 22ccc5b4b75328d059fecccd6353e9e4b69c7afb SHA-256: d4e4fb31a1552bd840c154b211b5c71eb1f4cd8d2fa3b07f40464b20f009180e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://xaydungphongphu.com/uploads/files/wotinojokokodiviremuno.pdf In PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/eb70a192bb18d86a93ad40c95120a189/5718426787.pdfIn PDF document text
    • http://yoron.net/up/files/nugebixorekitute.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b7754afc2---nuvamojakixit.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/d22e9a762cee7be954419667264914d8/27444196904.pdfIn PDF document text
    • https://webdatedepot.com/userfiles/file/wumuv.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161003e0232b68---dorik.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/pexokakukexizosege.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/pekow.pdfIn PDF document text
    • https://aneri12.cz/res/file/wedozixutir.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/gavezegotapugon.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6dda7fb66---resumesezeb.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/famuwijuzatipotodejomorur.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6e6e68bc0---talerokiromojufoguxufojel.pdfIn PDF document text
    • http://project-st.ru/userfiles/file/97897331370.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/dd3d5ee0f0752d38b1da4e1ea4a92e5c/59330360604.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/97945642748.pdfIn PDF document text
    • http://change4best.ru/upload/file/37819997250.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/xavoxazimujo.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/dukexe.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609879eae8dcf---5774595027.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/qstv9avksmqdu2mt1tf6brncc4/14725214177.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f10f2ccb4c12e51ba8379862bdff80bb/27664907854.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb472b2a52f---99121609471.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=new+mathematics+today+class+4+solutionsPDF 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
stream_006_off0000f982.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF982 18360 bytes
SHA-256: fe6a030cce3a1e6f7bc0bd98ffaf71e5932d07356b5efb165c677cd9129ebadd
font_00_sfnt_off0000e064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE064 10888 bytes
SHA-256: 833b12f75c6075846a83d7c106fbb8f9c24de380926b238b6c5bf56d2d03a16d
font_02_sfnt_off000115d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE2 18520 bytes
SHA-256: b0f4307b5e8b4aa718647f98ccb73d00345e60c0456513b34480917bf24d1d16

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