Malicious PDF — malware analysis report

Static analysis result for SHA-256 56c66595a2c6e4aa…

MALICIOUS

PDF

80.4 KB Created: 2021-09-04 13:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 85bc9b3a7855e447a5cf207c8293b744 SHA-1: e1912ddcb20589f13100679defa1acf9f8653976 SHA-256: 56c66595a2c6e4aaf64d0ec7ccbea0e216e9928dc6a020e73e1d4f30706d7a64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to other PDFs hosted on compromised websites. This suggests a multi-stage attack, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mid-europe-ex.com/images/blog//file/dikixutudeluse.pdf In PDF document text
    • http://zxsolar.com/d/files/dafekipogebimezasexizo.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/nmqrgjnk6ceo96u4b33o4de0c4/pikobunokogemi.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/vexotosujinaredurewimebiv.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210815052143.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/75172980383.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7c85d8698---petebivibo.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608058fe89279---lurigukijufi.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/sasawofokoji.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac351c410ae---10224344080.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/39491bb0f13faa0673fec1f83a9f5211/40047403266.pdfIn PDF document text
    • https://www.agcontraincendios.es//ckfinder/userfiles/files/61354112039.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/63933352121.pdfIn PDF document text
    • https://agatanorek.com/files/file/62256387200.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/fiwisateduz.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/3u6fv2sribikbhcicbqlirbrl2/lubivobujazuginoxepemosud.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c0799a5fbf7---51741481143.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0eb8b9d4ff8696e0606b69da767c970c/89868361516.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/mq1ilgmfcvq1ud8onmermi6ddo/26383084226.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/ccaf364d516dd259c7c7ab398073c054/7584418684.pdfIn PDF document text
    • http://elitvorota.ru/f/file/39397803880.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/88549917214.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=subject+object+questions+%C3%BCbungen+pdfPDF link annotation
    • 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_off0000cdc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DA 11268 bytes
SHA-256: a3022a7417e6fc5ecf0ee8c2a551b915b93c9ef4ae21b79df37fd36402719ad8
font_02_sfnt_off0000ff59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF59 19500 bytes
SHA-256: a67af9c8962fb178ded6e424c320545e4e669f2f2831ece13c80e319526818bc

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