Malicious PDF — malware analysis report

Static analysis result for SHA-256 759aeff124f722ec…

MALICIOUS

PDF

85.1 KB Created: 2021-09-01 23:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 915987a1e3f08f8f0799294bf775e239 SHA-1: 61143cdd377df3e6bd6aeb6d4868dfb1657c2d97 SHA-256: 759aeff124f722ec13ce17637f282c4d414bd4747941bfdf0ab609fbe1753766
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely to distribute further malicious content or phish users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms the nature of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://drafthe.ru/uplcv?utm_term=arabic+names+with+s+for+boy PDF link annotation
    • http://gearcon-eng.com/file_media/file_image/file/lewabosag.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/55ff484f7c35396ff6d5d5d053246e44/2124807430.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/596a84214c487a3c772260b8b938ea15/dobakula.pdfIn PDF document text
    • https://red-adlay.com/upload/files/38386481303.pdfIn PDF document text
    • http://mega.kz/media/upload/files/pujetiw.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/a42cb22fb22d3207e866e3abb5451419/94274986667.pdfIn PDF document text
    • https://conrays.ru/f/data/27322349355.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/99978842809.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/sodazabafazoxoxazatobag.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/b6bbb69c11e1e3050c1fd09aafa272d3/87295873718.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ff6e19b3d46---zonudisumegufi.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c21584d76f---59191270835.pdfIn PDF document text
    • https://paperland.bg/uploads/file/puzubetogibefapewi.pdfIn PDF document text
    • https://kimansion.com/uploads/file/4161103771.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/lomop.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160944ca56a469---3503755055.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16102f0e79f7b3---jilasudunekiduvi.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/pukuveluf.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/28195216525.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/memumezafipifotomanap.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/dabuge.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/fozukubijokivuxa.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/58984f58580791883d16be14abc1e1c7/804379408.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_off0000e68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9D 17832 bytes
SHA-256: 420378d94a5a8bdb2b19a061ca803debe9cf5c916b1dded67966564d921f3713
font_02_sfnt_off00012ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE3 10876 bytes
SHA-256: df8d0041368772e05ed591536e2f991cdfc23e6579b69b2688682bd79a4d0d09

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