Malicious PDF — malware analysis report

Static analysis result for SHA-256 d611b013f2a69d82…

MALICIOUS

PDF

75.2 KB Created: 2021-06-09 02:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c94ea7f35241482da533c4e4fafaa619 SHA-1: 49e75025fb4655c96e147ee2b3391fec6c647656 SHA-256: d611b013f2a69d8290bbfa0812f0f2aebd12bf7ab5d426fb55d54606ae2b0659
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the phishing lure aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=allen+test+series+for+neet+2020+pdf PDF link annotation
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606effaf5aa05---sofozo.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/wujiperuvavuva.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091cc327079c---mivewodalu.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/rirojelufejazakinafaganaj.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/96214892201.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c15320496e---lavijitobam.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/8629779335.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/06/03/53737013140.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701dad60dab---sifuf.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/7babe377c1bb6e749b3c26e0193302a5/36769537864.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/o0lrbp0im8987bl16ta5avaldd/fulerepoviwakevijupasode.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/sopowupitujuwekijola.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/18795308156.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210602193643169.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/58354871835.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c204a12eb1---22140064932.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D8 5088 bytes
SHA-256: dc2528d45139350c2891ed99fc86d26aee81378ac2aaa349aa14f7e8f44ad0bf
font_01_sfnt_off0000f73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73C 12012 bytes
SHA-256: 50c6972b2b82ccd537480e6178ea7c5cbd0dd7bfabb613509c326b321200af1a

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