Malicious PDF — malware analysis report

Static analysis result for SHA-256 861ab3a03313d9c4…

MALICIOUS

PDF

76.3 KB Created: 2021-09-06 00:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fe1b477fdcf91577c65a60eac2b58aab SHA-1: 0a50de508f3f05c0118548de80055010ec898a9e SHA-256: 861ab3a03313d9c471a94abab23973ce3ce6779300a5d38c8afa9dce7f1c5fc9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://treasurehunterdetectors.com/ckfinder/userfiles/files/31094305039.pdf In PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160fd254a6df12---delejuvojut.pdfIn PDF document text
    • http://turexpert.md/userfiles/images/file/sopetuli.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/jesukesopi.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075e4820fb70---bosuvozekoverakeledupoven.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b744370f11---86526944791.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/pomaxale.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609291c061682---gekajowosaxuzizidurixix.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/88382614090.pdfIn PDF document text
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/biwomixetobi.pdfIn PDF document text
    • http://houselandia.ru/files/ranexirusosilimunubololu.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/ketafajapuwosikubezekixe.pdfIn PDF document text
    • http://receptlap.hu/files/fepore.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bca8f581b36---pegilefirelonodijilebid.pdfIn PDF document text
    • http://chpcentre.com/files/file/vupotujenejefasonixopir.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/23321564183.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9010d5e7e---70753464401.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/wijagegupidi.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129a9ad83484---najuxefuruzefuji.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/92740027673.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/17269749527.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/9e37bda0901850bc55b8a6ee372ea86f/mekukusetekumar.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/31119681201.pdfIn PDF document text
    • http://jfk1969nola.com/clients/873000/File/fukiwikipejowuviforix.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dacd5e46188---donugafonosegagubafekavi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=import+export+code+application+form+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_off0000c83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83F 16632 bytes
SHA-256: 9c71240b58f41fcfdf4382166b96ac26ffb08a1dd4e718b363fe6b6fb6fb844e
font_01_sfnt_off0000f315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF315 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2C 10664 bytes
SHA-256: 0b87b7a5b59d0fb8733257850f0a8b985f7d43089ef35e5ee7c3b50a17caa4be