Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b8fc19ab10c41c…

MALICIOUS

PDF

96.3 KB Created: 2021-09-06 02:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 995b88f02f3db058526f17a09b4a962b SHA-1: 946405a99b60e2e163553ef59ead42ff98e813a0 SHA-256: 40b8fc19ab10c41cc5a1cd1fd63c6ed4123cb719bfb18d16bbbe5ac2d7836175
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, indicating an attempt to distribute malicious content or phish users. The presence of numerous external URIs and link farm heuristics strongly suggests a malicious intent to redirect the user to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://mariapolis.net/ckfinder/userfiles/files/wajali.pdf In PDF document text
    • http://elitaliaweb.it/upload/file/nusakamur.pdfIn PDF document text
    • http://afro-safari.com/upload/files/44363173007.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/46915c4aefc67599a20116c06b3233b6/vinafuwesurejopi.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076987b23407---84677290258.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/gjq1orf387aqj437jdg4srs2b2/87415613914.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/23916459595.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/kerakofaguzim.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/ruromanajumezo.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/70881500461.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/hd5t1a1gcv565oiav6jq334gb1/27921430518.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/66789172922.pdfIn PDF document text
    • http://posuni.com/userfiles/file/23438303853.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210614125732.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/wabumunowupuxa.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/wijanarovixubugabip.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/61423037845.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743a373cc77---wulaxifekiruri.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/96974243031.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/vree4dgohsmaivmev52pj913cl/wuxonufugotakofedonil.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/13873008520.pdfIn PDF document text
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/sasenixulalofibomepugub.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/remitet.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/redasebasa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=waste+to+energy+incineration+pdfPDF 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_off000111ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EC 10856 bytes
SHA-256: 7a4320f4e1ca7e9a1399425785b539557924998e88a8c62896310baa491cebf8
font_01_sfnt_off00012afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFB 18544 bytes
SHA-256: 7e83051b77317d194d7219658fbd81fc39100d4de8839c637d43b3cf83763479
font_02_sfnt_off00015b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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