Malicious PDF — malware analysis report

Static analysis result for SHA-256 4388d1c6aab69405…

MALICIOUS

PDF

87.2 KB Created: 2021-07-05 20:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c4abb68ac5cfe5e1dc8b18ce69b98c7 SHA-1: a298fb5231c1517bbd0a74557689cd252af77cc3 SHA-256: 4388d1c6aab69405767eb38b1512c57ffcd300ad4dfd10ee4c813500fc008cce
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The primary attack pattern involves leveraging these compromised sites for distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e34b167e0---27864124048.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cf7fbee4d---92294221307.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/c95e4912cfb98c2ba3c1d594e7817c32/99492011652.pdf
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccbfc977f7---xaxesupevotiwifulalu.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081ac8fa7b62---datisarut.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609a98afd13e0---198429453.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160da38e52ad0c---kutisunopebirudejomimuk.pdf
    • http://vstarmp.cn/upload/files/20210622_215711.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/03533f17e4966477fb162ce0ae387737/mifivagoretujixoxoz.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/pgdtd5p3utfl6uc5lvkb2tp9bh/jisatugejosemebemamar.pdf
    • https://nisahanpin.com/calisma2/files/uploads/pagivupududuruwulopuw.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160948414c2f6b---tarusu.pdf
    • http://markasib.ru/ckfinder/userfiles/files/42731005793.pdf
    • http://logo4you.dk/userfiles/file/mixepifuxalilasusowimufo.pdf
    • http://artechq8.com/beta/uploads/files/310022837.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/194e94ba318e2ff89a4261a795ef127a/20363127891.pdf
    • http://pphu-joanna.pl/fckpliki/file/magut.pdf
    • https://daaeportrett.no/upload/file/wodage.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16090118987065---timotufavuwimedetul.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ac746205ae0---xolalaruzokelowet.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a48aa316a6b---96988313620.pdf
    • http://eko-inwest.eu/upload/file/38211765688.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/bb353fc7a2f55831585ca1c143443dd0/mopikagobogodu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=forced+air+convection+coefficient
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f215.bin
58e5384bfb76c8cc2beeaa2617c66a87d547efe16caebbc82c511d9b5d2befed
pdf-font-stream PDF embedded font (sfnt) at offset 0xF215 10300 bytes
font_01_sfnt_off00010969.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10969 16792 bytes
font_02_sfnt_off0001217b.bin
3eea6ac73240f42826aec78374017c97af364d9ce9ec16bc5a0b1dc5e9def9a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1217B 17616 bytes