Malicious PDF — malware analysis report

Static analysis result for SHA-256 acab0c7e8e622177…

MALICIOUS

PDF

76.6 KB Created: 2021-09-07 20:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 11858d19fecc6073c20e804a3cb429c9 SHA-1: e3e3908f3c1385f13a5dcd78ce6d7b80740a208e SHA-256: acab0c7e8e622177dbaa3d7f3d8188dc867a8600ba5b1b7f214e746d17dd2c42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://koratspring.com/upload/file/65788298770.pdf In PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/25130409894.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/79133827221.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b023045e0---35035088237.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/gefuxetuwegokuvaxe.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/a3b98bc7574ce853ae2de53ed6a110b6/texive.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/f6c5b1ba51774b09749f135c48261682/42560240295.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/71739943976.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/vetoveterubomukiwa.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/21751609322.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/rapuz.pdfIn PDF document text
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/76757165498.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/senuwavage.pdfIn PDF document text
    • https://castel.ro/userfiles/file/10601248047.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a3ff2d9292b97d8bef13cdb5983eac73/8407747663.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/71134117490.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/81184309531.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/gusezalezilukisoniraxob.pdfIn PDF document text
    • http://msiutilities.biz/documents/79594107177.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202107/file/1625203101.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4446d42c12---75130533278.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/b9085f2804d3e3bba57b42c33289cb65/85938266814.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611b19940a174---pufafigipal.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b333ce68e9a---45021728707.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/xudurolojulixat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=baluarte+elvira+sastre+pdf+descargarPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/1ab4495d5be30db8fef9a1818e2f0bce/12890390060.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_off0000c5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B3 10788 bytes
SHA-256: f90991b2f329e7e0093167e6697762e62837ae9b59d56a37dcc3060608101409
font_01_sfnt_off0000de86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE86 18272 bytes
SHA-256: 3179204c56bf9118e0c30a70440d4b751312871759c184e97610d269c70795f9
font_02_sfnt_off00010c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1