Malicious PDF — malware analysis report

Static analysis result for SHA-256 48b71b5da4b1f409…

MALICIOUS

PDF

82.9 KB Created: 2021-09-13 19:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 69fc13ae4c64a58ad8868584817522e8 SHA-1: 872f5928a5c4786d2dde97d8e47938a928949387 SHA-256: 48b71b5da4b1f409fed98bed37419a614fffbe6524606e9d0afb04213d009cee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicative of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. The presence of these links suggests the document's primary purpose is to redirect users to potentially malicious external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://laborke.ru/uplcv?utm_term=stream+mugen+train PDF link annotation
    • http://apsencollege.org/test/fckeditor/file/zesikafonagiduxosi.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134cf93903b1---nepirejorigudowizetazor.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/82593733330.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/58839216673.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/20269463041.pdfIn PDF document text
    • http://klpa.net/userData/board/file/69710861643.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/wevixafibevajiwujuduvodiz.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/25779409208.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/75670661332.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/44959368828.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/duviwadiw.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/68083103240.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/poxasagadop.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/zesujorubavokenugi.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/176dee2c75053cb6ad20c68a78d17c54/97509379440.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/rabetadesadokepubopofoso.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/riripugidulesadur.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/67217315264.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/vifopidegifozuma.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/62946534445.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/44361871661.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/potoweperadanunisote.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/xaxunanuvonunozugele.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109081211111754.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/63683616999.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/a30567e08a969b65c2dfb190efd0e893/gunebu.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_off0000dcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF5 18876 bytes
SHA-256: e09c3f8dc8d9e570572a216bb4d81da329cd7a2672e362adefb38a714c1d7762
font_01_sfnt_off00010e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E98 10292 bytes
SHA-256: 55dd969c15c964e806f57c8007613f99fb3e0b16833d043414fc63b864dc6551
font_02_sfnt_off000125c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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