Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c5c3a7fed8e687…

MALICIOUS

PDF

82.3 KB Created: 2021-09-05 04:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0c061b50f656f8d2deeb050d636ec699 SHA-1: bba46bfa2673632c5cdcea5c144d25cba4c0940d SHA-256: f4c5c3a7fed8e6876fe1297a9778492d5a25e06dda614b735c3b4b07d309651b
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. These links likely lead to phishing pages or further malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/1ac96bc627d29cf7a31f37460c6141f3/sebewupuvug.pdf In PDF document text
    • http://altelaw.com/uploads/image/file/30025335697.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/d4b77e8e0b4bf506e33ab03efaf6ef20/6893133136.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/hjll6urbfn3m5bq5o0oedcf125/rejotupexotaz.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/vorewukidanoma.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160976042a5860---98956033545.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/47349475061.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/taxudesovisojurusigesali.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/14907256910.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202106270614323988.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/76533262405.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ed4fbfbc4---4086474460.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/96bmu1omoo358pq0c3kp3j2r57/tixebefefaninatigowom.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/69028753716.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/xutanafomexapufupose.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/c110466be24ba8d1d1b104940f7f49fe/talulawuwepilowew.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16089e2b93b5bb---wuwalefewivigogim.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1b35bd06a---wewekigukuvede.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/jokatuwotojum.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/dutikorub.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/rurobuf.pdfIn PDF document text
    • https://sanagustin.cl/files/92652056165.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/kipawebevigudesimeje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=les+preposition+en+anglais+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_off0000d9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BC 19692 bytes
SHA-256: 8221d7e0a85f84caba49bf42430de943d7af281b03bf044c1483e695bc08947d
font_02_sfnt_off0001232c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232C 10632 bytes
SHA-256: ed45fffcb341700d0622ac3ce9c5a924da16da706a0d2a22ead268dcde04b864

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