Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a0c7ed950f5c5f…

MALICIOUS

PDF

97.7 KB Created: 2021-08-11 23:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 62aa0421b2c155cbd1f5b23e80660a44 SHA-1: f12c4524cc99de89113882ff52fd96bf74bcd1be SHA-256: b7a0c7ed950f5c5f5f5f953fcd9269ebcdf81eea1f2afa1e8cd8a568f34127a8
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of numerous external URIs and the structure of the PDF point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/355c21d333d563373a02cc56f3d1fef7/pubijiduwomanaze.pdf In PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/51f5a7028169ad62fc1221645dd543e6/wozifokodiwidokonekek.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/54b3021e3393ef1890fd166b1b9a273c/gidaxigitawi.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16252664141514101839.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/963vqaegvn45u7cd3r1tdfk01j/51229047819.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/xedagazokudikagopera.pdfIn PDF document text
    • https://capecoralliving.com/media/file/seregagukifewerolo.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/reximujotamapedobos.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/ef921f5e3bf4446e23f109963ab17403/fitosininiluz.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/4869b8c1a9006b57940f51701c026671/62240142867.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/garovug.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9af7825061---12074045239.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/laliriravev.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/17c72d0072e95a951041272c2016acdc/remodefexetexujogaju.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/46054266418.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1872c3066a---pefalevev.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/290b6dccde3ecea6856a4cec87fa09b3/35958142847.pdfIn PDF document text
    • https://abeess.com/userfiles/file/6884881169.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/862nhotq6n5papkifrh6ij1qf5/gibuvusaxobabotidugu.pdfIn PDF document text
    • https://x-software.cz/data/file/22688957148.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6fd6dc9ca---ruxafokironedarek.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609edc4e9f037---xarebapilufitulo.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/40160066233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=exercices+sur+l%27imparfait+ce2+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6F 10896 bytes
SHA-256: c002e523afdf59c5eac99379b283895674f6888f00efcc93e22eecc5eebbd5ae
font_01_sfnt_off000116c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C6 16560 bytes
SHA-256: abcc6cad68026f4ba0f7cc4de8ab0bc5efe7dd4be5b6b48f3d60849661afefd7
font_02_sfnt_off00012df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF4 19448 bytes
SHA-256: 81ec39a3a305a321711967bdb8e5e2dbb5d646feb5cb6d572f5986b12e4c92c2
font_03_sfnt_off00015ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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