Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b351ee07b08acda…

MALICIOUS

PDF

86.5 KB Created: 2021-08-26 14:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b97bab695dd86ab3067c3e790a43b52d SHA-1: 9b6463ca832cab8025c89a792b79650fd08b93d6 SHA-256: 1b351ee07b08acdaeab36505c6b81f12e0fee0c308d28e78d776cdc084b59d68
196 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely serving as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://fivetc.net/uploads/files/namar.pdf In PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/dabore.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/65880319864.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/16846820369.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/c636e677ccb62886c086397c853cbfdd/wufovowodimex.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/44gjavfk5krdr8spdfpcmdbd5r/didefupulunitufirote.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/refexanekufuzu.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/28320275076.pdfIn macro / runtime command snippet
    • http://x-site.by/upload/editor/files/puwilegajibuwa.pdfIn macro / runtime command snippet
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/kepukamewuxutaj.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/v9j8514uaef1a4uua8sf1h4534/mosujom.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/jikeaptevpckmrej6isfbgjg0g/71605877493.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/46a5cd18bb5bac4904d766d345f63c33/34238825401.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d822641d41---sejeje.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/nopositatebut.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/k95n73s8ffckccgbpfcisq3185/doruzonifumipesi.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d453537b06---26991383162.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/japuwoni.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/gudefivo.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/61894806116.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/1675407124.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/lajolukobutumedezanitokof.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/tujep.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/e7b3dc39ef9663070dc70cf08c2ae4db/junetewanidotit.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/45420649753.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/25235516082.pdfIn PDF document text
    • http://okwecare.com/usr/useIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=factors+that+influence+photosynthesisPDF 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_off0000ed6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6F 10768 bytes
SHA-256: 43591f6b6c45602fe6d3af36fef54f31238b9476265701fb486f5389331a63dc
font_01_sfnt_off0001062c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3E 17244 bytes
SHA-256: e2a3ad65608ba6fb8e2a3cf223eb784da65728440593c3867360de0cc42e6ab1

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