Malicious PDF — malware analysis report

Static analysis result for SHA-256 a281998d148cc65f…

MALICIOUS

PDF

82.9 KB Created: 2021-09-19 02:27:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5a08ab1e13445059ed4fc1abeb3fab77 SHA-1: 956daedec7fa27f3ee6fd8e597152f01e5957754 SHA-256: a281998d148cc65fb4312e42ea4fe30c752328b9b876f052c7ba4255b7a6e6c0
184 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a lure to phishing or malware download sites. The presence of embedded JavaScript indicates an attempt to execute code, likely to facilitate further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=what+is+mean+nfc PDF link annotation
    • http://seyrimerdin.com/userfiles/file/79837590107.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/guwidudipegupuzit.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/repusalevim.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/falegemofusixamuwu.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/95675471872.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16143f953db62d---vebesejirusaziwogituniluf.pdfIn PDF document text
    • http://jump360.co/upload/files/20210913100457.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/ff2d5ae405e15fdff1ebe9eb7dc94e9c/silanamutufixizebajilifu.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/gepelafewi.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/85011073538.pdfIn PDF document text
    • https://priscar.com/documents/files/99897949344.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/21709998197.pdfIn PDF document text
    • http://abwrva.com/uploads/files/jujaguzigofivetelisexa.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/ng949viaus9gec7f6qqdkosqb0/86135258698.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/panimurirube.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/50049361554.pdfIn PDF document text
    • https://eltdb.com/UserFiles/files/9558033505.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/26350310817.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/ep385t252isgoru7ul027bhor7/41280590823.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/86173364677.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/sirorozetinu.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b74699c574---96442001444.pdfIn PDF document text
    • http://kmsenior.org/file/files/56522744037.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/wugetufowebusuvi.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/46824040323.pdfIn PDF document text
    • http://taigesw.com/upload/files/vimamusasivizoxibilikiv.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_off0000e164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE164 10328 bytes
SHA-256: fa33fcaac3205f2ce4f72d8f516f6b69636a5cb90c55abb093a41de0c36df08a
font_01_sfnt_off0000f884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF884 17592 bytes
SHA-256: deeddf5de626a881fbf64961ee72595e9539512cf5d4b95bfa1cb7fc44fd60c7
font_02_sfnt_off0001264b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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