Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8b09607e1ceb2a…

MALICIOUS

PDF

69.7 KB Created: 2021-05-26 08:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52c37866d7ad329b382f4af24a155522 SHA-1: 0b49fa1f80a4318234bbfad3e5dacca2130a8ea6 SHA-256: ab8b09607e1ceb2acce9cb97c31ec70db178e4b7fd379061e456e1cf5642e70f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The PDF structure and embedded links are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7de1e7dcf---paluwilu.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/gjm1h2qvbkks76ut4ln7t8vlfa/95954523445.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/cjl4i7p7rjkm2lkudblaa6akh4/19660869996.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/6ag648chdiahmt1v8s8nlcut57/34179510853.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/2g0irpid98h5oefoobvdih8712/xetejevebidudu.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/72903710358f32959179c757afbd45b0/domig.pdf
    • http://goldartline.ua/userfiles/file/suweleruzedunaxisasog.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080b272f0e78---fupudajefatag.pdf
    • https://webtechnocrats.com/upload/file/91166956243.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc24ca964c---xotukuwujiremoxodusotid.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa158e6364---40224127600.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/0irlf14co111rq98ir8m2c220o/memuzox.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073e02a85bee---pelozunemubugumebupifej.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fc5adc9697e89c1accec19ea8407627c/mejepuwonogevib.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/qdhbcuiua0kubn1de8m9f33olu/30030072325.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721e2ea205d---82999224143.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096adcda2898---54693597447.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=ejercicios+repaso+matematicas+6+primaria+santillana
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d13a.bin
66791b01ced5e6e25be6be62834b4445e26e17c5cd525e11c85ed47815c880b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD13A 5264 bytes
font_01_sfnt_off0000e30b.bin
5186b56a27751bcf1485ea8bc5d35ddc96cab311523d896a237020ea59bfe39c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE30B 11352 bytes

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