Malicious PDF — malware analysis report

Static analysis result for SHA-256 930e1ab7dd21c323…

MALICIOUS

PDF

72.6 KB Created: 2021-10-04 08:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ca99c148a86bf45a46b0830060c584b9 SHA-1: 01b61aedede70bfbc14190126d3433bf1d8e97d0 SHA-256: 930e1ab7dd21c323dbf0b9d145d32b2075b2eba4a15c562c3666a5ca619df65d
176 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to external resources, some of which are hosted on compromised WordPress sites. The document body is heavily obfuscated and unreadable, but the heuristics indicate a deliberate attempt to create a link farm, likely to direct users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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
  • 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
  • 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://ekachaiguitarist.com/ckfinder/userfiles/files/78154610797.pdf In PDF document text
    • http://dansensvenner.dk/imagesfile///zafuwaximu.pdfIn PDF document text
    • http://pwharrison.com/userfiles/file/rekukawonivejazi.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/b22da871d300b60cc178c0b50c304a8a/60971009179.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/16699350979.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/29032731755.pdfIn PDF document text
    • https://borsalino.ro/imagini_ws/573760026.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/45969953326.pdfIn PDF document text
    • https://korankertas.com/contents/files/35259013568.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210918215009_3z2wx8.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/nudisugojo.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/lolufivi.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/4338956419.pdfIn PDF document text
    • http://pinxedien.net/upload/files/70444119958.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de4358f015---nifitipir.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/xumuputetojaw.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/be294487e3799ac9730e7a8e12b837bc/kigojidet.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/91525043599.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/fijobigowafikuv.pdfIn PDF document text
    • https://servicepapik.ro/files/rokaronozuwadu.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/levajamiwotojuw.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/biratewa.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614d6e00a7de7---60196856253.pdfIn PDF document text
    • http://zatacorp.com/upload/files/81203323830.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/72944813778.pdfIn PDF document text
    • http://ks-klinika.ru/ckfinder/userfiles/files/koziwuvuzevuxifukad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=epidemiology+questions+and+answersPDF 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_off0000b5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BE 17716 bytes
SHA-256: f606c89d831a546b026717d45c8f33ff7544b75af2f91e4d04f2c3c2c482f73e
font_01_sfnt_off0000e303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE303 11164 bytes
SHA-256: 0199298446bf24794e111242839fced2ce23a565bebb933e61dc5722b0d300e2
font_02_sfnt_off0000fc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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