Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae1d4080b3054b20…

MALICIOUS

PDF

95.9 KB Created: 2021-08-15 10:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ccb25026bb81629ee954ce38e5658599 SHA-1: 492d15784172344c6bd8dcac30ec3c1cff96b2f0 SHA-256: ae1d4080b3054b200ed965f2e8e8b4d7a2326105ea24c0b3a3afe7a7cb9cfc60
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host and distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ea06c5b49---37514775135.pdf In PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ubkpagrvaah47lv1m0gnfojcq7/51577889596.pdfIn PDF document text
    • http://hanleyresources.com/images/80285522077.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/lipegogagozi.pdfIn PDF document text
    • http://tele-video.ru/upload/files/minaxewoledamodawaj.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/odsl7k10q207vsgqdshc8joc5f/93952108952.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/6d643dd9baaf9485ea4b3922cdc88d0b/1774977783.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/mefetinosugituvakaboduz.pdfIn PDF document text
    • https://signika.pl/Upload/file/vidiwigiridawosekev.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/70b33ddf6ebc19dcab097c555044fe88/nuxebejofiralugofixadoki.pdfIn PDF document text
    • http://kotolantopeni.cz/file/17742648360.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/41720549930.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/donobiporiwemovap.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/57408902695.pdfIn PDF document text
    • http://merwepizza.com/upload/file/lulaxofilitevokobu.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/33u13ckrhmnr8iffeafcuqtr6u/mevuvufewufipivo.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/6e2836a27c0e3379f694e0811be4e296/86235589103.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080290386f19---lisijaz.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/b754b94d0f27a03fc4c3ed60f5a0a02c/kezamisododegeforekiz.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/rumad.pdfIn PDF document text
    • http://ttc-investco.com/img/files/sakujowojonejodurumiziser.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/kapopigijibanabu.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/vgv70s32lfjp20puam1jdnmoq6/46628632675.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/bajotodokefuvinobowuwemuf.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/41198980108.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/xevebolapupuwebijageva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=fundamentos+de+econom%C3%ADa+irvin+b.+tuckerPDF 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_off0000f5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D2 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_01_sfnt_off00010b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4F 10988 bytes
SHA-256: dd0a5e5cf3d8626153a83f44c690737c75e5258735aebb2a3d73b695fb2ce371
font_02_sfnt_off000124d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D1 19332 bytes
SHA-256: e8a564df8d06a1b2f29fa1f064d1c2ef8e47917feee711a7aff7c5637789ac4e
font_03_sfnt_off00015642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15642 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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