Malicious PDF — malware analysis report

Static analysis result for SHA-256 95d93e741b7fb1bb…

MALICIOUS

PDF

84.6 KB Created: 2021-09-08 02:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: befd59f34f910ea55c86dc68291db8bd SHA-1: ddaf802ac524ca699bca04fc4daba47f068d9494 SHA-256: 95d93e741b7fb1bb9cfb87ed9ee5af61789e0c4cbf053a4e151bbc8488bb1305
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous URLs, many hosted on potentially compromised WordPress installations, suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://anhuicrew.com/upload_fck/file/2021-5-12/20210512000429550641.pdf In PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16071b52c56163---zizuwelaketodosis.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a12178898e8---norodasigominuvabe.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/komavikizilube.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/e96f400mdknh8fv582p74mm7oe/laxizav.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/bimajutefala.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/dijemomojadumegezaf.pdfIn PDF document text
    • https://stvorki.ru/files/file/tedufalakovufedafifi.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/81901448872.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/83724961714.pdfIn PDF document text
    • http://safarang.com/basefile/files/kudefit.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fad3e71971---94837767858.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab85c8ed97---72378061641.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/rapofepejopijaki.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/26f145959016b79b98bc59de2bfd68af/375052790.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/20568654903.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160774047d3506---xepuwedazaruniravutuda.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/245f15e3c4c6b8cdbe26add53352871c/winusowoxagod.pdfIn PDF document text
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/lonefifepadiguneraz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=kahirapan+sa+pilipinas+pdfPDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/nejisikaxijufumosireb.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_off0000eca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA6 16180 bytes
SHA-256: d360c752de637d8c867e6aeaeb61e9fea29da040ec8db44b2f81eef16b3f35a5
font_01_sfnt_off00011684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11684 10236 bytes
SHA-256: edf3344a8d61268c801362fe40a3d3d1d8fff708c039e5d0b301a18802ca8182
font_02_sfnt_off00012d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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