Malicious PDF — malware analysis report

Static analysis result for SHA-256 6706a62cbdee2e57…

MALICIOUS

PDF

79.4 KB Created: 2021-09-16 12:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0ffac782ff287a8306bcb703dd2cba3a SHA-1: 2613822cf1c1d54c0031deb5919a550aba076475 SHA-256: 6706a62cbdee2e57fd3d91308d6f4d2048c4d9a7b49aeab01ed4e826498f37de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS platforms. The presence of external URIs and link farm characteristics suggests the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cructi.ru/uplcv?utm_term=what+does+a+smoker+do+in+minecraft PDF link annotation
    • http://enidental.com/userfiles/file/20210903205425.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/17020915509.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/d4e6a29ecce337a9ce2736cabc425694/pabarolokur.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/56894308936.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/7796611631.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae78b44093---40801368674.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/27765095611.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/9br24tusq606bffh6r9hjcctg4/lamezadokeluwizovij.pdfIn PDF document text
    • https://okazionche.com/files/xiperulaxulokoxixuwumu.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/19524336139.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/sakurozeseme.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37176352783.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613921f52d036---33479658291.pdfIn PDF document text
    • http://lex.tj/img/file/85747463113.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/69874885411.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/51469333562.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/duveviporiporuvopibaxuz.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/56438573196.pdfIn PDF document text
    • http://erex.hu/upload/file/demelomomuvijojukela.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/69429722827.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/rebaxakoxekukirof.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/meposipoluto.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/levajokukunijuxatugorejor.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_off0000d326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD326 17192 bytes
SHA-256: afea957f38159e3c6cedfd1de09ac9df31bf62d94d9eb74a747b94b713df0f8f
font_01_sfnt_off0000ffa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BF 10780 bytes
SHA-256: c5f3afa0223481e831167e4c9095b0aa5ffd758600a5d1d97fb3a7dd8ad3b47b