Malicious PDF — malware analysis report

Static analysis result for SHA-256 12acd04860f7b995…

MALICIOUS

PDF

72.7 KB Created: 2021-09-12 04:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 177283ea3e20862fb8338baf20b0dffb SHA-1: b0110b30a738367f7e603c2baea4bd70f098dc47 SHA-256: 12acd04860f7b9956c3138d4dda226eb63649e3e619301b25224359b245fab0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm or phishing lure. The presence of external URI heuristics and the compromised CMS upload link heuristic further support this. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external sites.

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://garglob.ru/uplcv?utm_term=android+system+internet+may+not+be+available PDF link annotation
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/5f003d9feaa66f3964232fedc13caf88/revonugubakobajugeviwo.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/cd0208d56b3efadf51fd3b15b5e40073/dikilopowarufuno.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/mafexuxurapagu.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/kilafinejetujelaw.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/luvakegopex.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210903130707.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/soketoxadudimoweturizi.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/fotodafazasenajugevamazu.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/47053180142.pdfIn PDF document text
    • http://whitepalacegrill.com/userfiles/judubutow.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/wexexelumozikitemamigax.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfc45c007a---fabodedimene.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8984719ac---87223165158.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/nedotibagol.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109111749332565.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/75795137550.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/sekekupowukoxupadu.pdfIn PDF document text
    • https://davaocarrental.com/images/file/donobexuxurafewagixa.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/zuzevirigixokibosib.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/tejalabex.pdfIn PDF document text
    • http://secretinvitation.net/images/files/vivejexuvegojaxozoz.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/foxidefara.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/96870007814.pdfIn PDF document text
    • 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_off0000bb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB77 10708 bytes
SHA-256: 9d92adcbc2bf3c62522c90df3d6ca33b2091a32cd37798264d0c626fec6dabdc
font_01_sfnt_off0000d416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD416 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC28 16044 bytes
SHA-256: 097575d8a4b4ac0398409e9c271d20a278f1eedbf8d89b14a8458476b0857b24

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