Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab31ea4d836d9cd…

MALICIOUS

PDF

86.4 KB Created: 2021-08-04 19:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d45ac4d5c69684375d7bd0131692fc92 SHA-1: 1b3f15d8c0c09b7b84eef6e27db9b193a47fdec4 SHA-256: aab31ea4d836d9cd37e29569e6dcbad6cf88943f749ba19fa46d9ff4eebdfd60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, presenting numerous URLs that likely lead to malicious content or further infection vectors. The presence of multiple compromised CMS upload links and disposable hosting further supports this malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://crysiq.ru/uplcv?utm_term=new+headway+beginner+textbook+pdf PDF link annotation
    • https://camelcarpet.org/d/files/82376930818.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160856c59bc39b---kudivigipidevo.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/mumagevi.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/af46f5db6036c22e28c8ce91d48ad7ca/wukem.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/23940407286.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/48828078725.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d286f564ec5---muxig.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/b434vdmusbulfadrccks0ftru6/36935001516.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/rajubukinumiwodenikemor.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/wigusubiridumudedevone.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8c11c6902---vukebexemil.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f99084c800---fekituba.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/fakaxuserujaki.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/84593987411.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/q0s788ec2boljp03a1nm259eju/68678217706.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1fa0ba0ed3---pabikopetes.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/q0ggg8ta4q0chs08n7f4ci5hr4/wagur.pdfIn PDF document text
    • https://retta-bg.com/userfiles/87609212219.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/33737384194.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210613125053.pdfIn PDF document text
    • http://distributoram.com/files/file/20513559784.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_off0000eb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB70 17256 bytes
SHA-256: 1655b11d504a5fcdabccdeae417d8c55b355d99dd8908037b385ddb8857c574d
font_01_sfnt_off00011866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11866 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001307d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1307D 11076 bytes
SHA-256: 679250bb3aa22244f7a770afcf49a19600d949ec6bd5c75e6b86c833a4836d54

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