Malicious PDF — malware analysis report

Static analysis result for SHA-256 92df630f7d5837dc…

MALICIOUS

PDF

93.9 KB Created: 2021-08-30 11:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9b180553ac71c2e6eaa7c2b94837e1a0 SHA-1: 4fc4bdd733c39550b9d4ae9c8c78005a304c69fb SHA-256: 92df630f7d5837dc49a50a275cce4ea66906e526b8425ccf9c88158a9d103acb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, suggesting it is not intended for human consumption but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://trustarshida.co/cache/fck_files/file/49577756039.pdf In PDF document text
    • http://alumcity.ru/userfiles/file/34919988284.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4c2dc1c4f---miworodezodipisamixi.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/f5bd7lcvkr81a23kch408dh0t4/gejifikeximevi.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/gikison.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd51e778d1b---letusazed.pdfIn PDF document text
    • https://cape-electronics.com/media/file/79184612941.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607005c808ac2---laxukipika.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a12bd199b16---6450603669.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/1951218711.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/dubotefipewugixutat.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/58325813396.pdfIn PDF document text
    • http://lowchens.org/userfiles/file/34019168426.pdfIn PDF document text
    • http://djpress.pl/Image/files/68989086348.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/79408353130.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/s6l55ceukn77gv27omsoehp7kk/62665239072.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160811daba43f6---12510549975.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160866a833c8ac---zadenapesarafizibuzoguz.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4be711b8e---38069036659.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/4511a8eac9f761a5f70b0841bdb2bd2c/75576952629.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/90824538036.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/zalosagazigedovo.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/nolakujutunufiweteju.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/56618666864.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/noduganomojemes.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16105e69ca8515---lewamatuwuvaguwoliwosap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=penalty+for+lying+in+courtPDF 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_off0001093d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093D 18536 bytes
SHA-256: 303b0850671bfbecd7fbad31c4f2fe14b859406ac9a39bde863db545211fe1c4
font_01_sfnt_off0001391c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15133 10560 bytes
SHA-256: f757ad5bbaf58c2464c14f37e20f90428f9788b666b2f59bbf91f4558f2b15ea