Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3899c11104a577c…

MALICIOUS

PDF

92.5 KB Created: 2021-06-29 02:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: e4c2bca92ed6cabfd8e9bf081e130110 SHA-1: 83cf3be6eb3d75182b91c76c246e6e9eb2f9c44f SHA-256: b3899c11104a577c300b905b832dc195e074add5694afa46ad6d1f7b7b93ca3d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/ece629c9918d194d66515db33abc643a/lexemetetavijuladajokisi.pdf In PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609df8372aba8---seripuvepedul.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/denobupuvesoge.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/guzitajafudedofatidu.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/37c51097136d646fc8deff517f5e7e75/jamudaranafemoxujol.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a217b10c5---58579805463.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ca93eaa66---pesawidufex.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/rf3qic2bu78gpb2i0nljdrkdt4/61046155535.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/mojotugi.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/28756826935.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74cb285d51---wivamikidirebesuvabobamo.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/65390729131.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077e275a21b6---9182102018.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f2ea771c1---10048228961.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/62c02a5a84a771a6b7fa0645712c2947/zobiwukekunu.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab5b63d117---magurabuvag.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/t1vc05bg5dvvmq7g4ru6qha37c/kajoxazupajovepomil.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/59080019685.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b205c16e1---59329962369.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16087ecb511571---5372841693.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4c2b3a6a4---90901252511.pdfIn PDF document text
    • http://project-st.ru/userfiles/file/62950502736.pdfIn PDF document text
    • http://tochuchoinghi.org/files/bigogutipagenejiba.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e5f1a61b1---15376631827.pdfIn PDF document text
    • http://soupworld.de/upload/file/xisemojituf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=what+has+to+be+broken+before+you+can+use+it+answerPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDE 10912 bytes
SHA-256: 8006717c8928d339667ad919af874de1ba736be28ecea85b0daa4480d2f5fd51
font_01_sfnt_off0001073d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073D 16416 bytes
SHA-256: a8d1e34bf444334761db8dd673e30599a677bf9ec537d4b136fd145dfe542046
font_02_sfnt_off00011dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000135bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BF 17144 bytes
SHA-256: f63fd15520c0995719c46ab269aeac48b29bee6cec6b170bcb7c09da2f5be45f