Malicious PDF — malware analysis report

Static analysis result for SHA-256 83018a20e7325e23…

MALICIOUS

PDF

70.9 KB Created: 2021-09-01 06:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1ba01b17006538026e1f5fd3c65bcd59 SHA-1: 925b38c5f9e7ba69dbe9efa4246fd0d9146e9b20 SHA-256: 83018a20e7325e2306d17c7b9482b6667affdfa8cda0d5743df05843e3a46bde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised CMS upload locations and disposable hosting sites, likely to distribute further payloads or conduct phishing. No scripts were extracted, but the PDF structure itself is designed to deceive users into clicking through to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://sva-jeanroze.com/xmedia/file/latadotaf.pdf In PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5f12c4565---ronomumojuwakinas.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/60b796c4db2882255e490e7bafca50aa/vewimimojekowanujilaf.pdfIn PDF document text
    • http://vtaky.sk/media/file/togebepazagunogedawot.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210612102721_39j7ad.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5790084e11---rutabipekusetibodilon.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/c751403d21ea41d0ea074ed4ffd768bb/muvizesexorogimimab.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/a1cb48d6cc73fd68845781e9c4224c94/nebebamutuvopirubev.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210831101636.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/bivisibetedi.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160717f27cd616---tezodezef.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/2976c521357e715533c446438a72aab2/newafikenuvexolejoru.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/87m07pksui67f8j1aitvc1b352/pabefo.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/pawurujidewotabuwo.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4887c05197---5217081301.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b80c5824710---7549398406.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/lalokoduxovusirepuxo.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/sl6jdgk87lnm3lt33sjbae3des/kelilowe.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/bobamojapujenizizevita.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/25527071037.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/gopipokesadot.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/d547d63f4a832a906526691de4ad577a/dumobovefop.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/zuvola.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/65508714252.pdfIn PDF document text
    • http://ntrc.biz/clients/f/f0/f0759d16aca5b3dfc9163ee994587b7f/File/71052922501.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=download+ios+14+on+androidPDF 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_off0000ba4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA4D 14688 bytes
SHA-256: c5f8f4703dd59e8bfe0404d3f79385d3f6d9cb73bf3953be235bad78efcc4097
font_01_sfnt_off0000de4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4E 10228 bytes
SHA-256: b773e5864b779f48100f145ce4fec8ff461ed14e14528df7318f5b39b918bd92
font_02_sfnt_off0000f571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF571 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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