Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae044a7f5178a14f…

MALICIOUS

PDF

85.3 KB Created: 2021-09-18 21:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 758e5e8e42209804a64c8e615cbee6dd SHA-1: 3edef436660d189f11e1b146e486768b2d0380c5 SHA-256: ae044a7f5178a14f78528bd1b4be85e1db3da520c1b7eb7d02f0114c5f5fd43a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous embedded URLs that form a link farm, pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document's structure and the presence of these links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://synerhu.ru/uplcv?utm_term=switch+emulator+android PDF link annotation
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401c4c2857e---lazabixilozodajubunopi.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/19023318886.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/161413dcce9ca5---95439207243.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/niludaramimufarogi.pdfIn PDF document text
    • http://somersetcountybar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18262621245.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021090615520073499.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/83858440358.pdfIn PDF document text
    • https://zzwgjx.com/d/files/fobixev.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff51f56d9f---89415171565.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161457009755bb---25307142840.pdfIn PDF document text
    • https://mcsfood.com/images/file/91348383412.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/33475750824.pdfIn PDF document text
    • http://coolscape.info/images/files/lusojiliror.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/31030352194.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614367590dab1---tobofup.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/70396708422.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210907002553902280v8z7e.pdfIn PDF document text
    • http://debrecen.varosom.hu/userfiles/files/28947524944.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/66313784053.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/ranapakesozari.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/fujalujubagure.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/74542932564.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/48579732742.pdfIn PDF document text
    • http://theponghop.com/upload/files/pujirogefetelezupi.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/19135829390.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/kiralosojesipupi.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_off0000e312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE312 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB29 10728 bytes
SHA-256: 979357310ef3520a882b38e65badd44ca480d244e39aeecda62b7d61ee8037f4
font_02_sfnt_off000113a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A7 19820 bytes
SHA-256: 9a85b8474a32f88405338a2c7a3bf724433e9a5a5de659b39c4918bc55c8be99

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