Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb1f657a320d1f94…

MALICIOUS

PDF

145.6 KB Created: 2021-07-24 16:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 27be75939181ebebfbb68f9d259c292e SHA-1: 2a7cecbbf78c2d6a9323d454e64413ddcb5cdfb8 SHA-256: bb1f657a320d1f94d7f614e86eeb572c5f99653fa62bf95002d197e857373750
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The embedded URLs suggest an attempt to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9600

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://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zonovolibeduxurarubevaji.pdf In PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087432cb8668---60284286002.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/c61af6be1f1c459ae05d2b216be38bc5/47663305816.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/49994781673.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/1v2dfhi8gfmuh8cmbh03olkgs2/tawabibajakabapi.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/tizumirexejirido.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16094ac8c856ea---65335943459.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/23550329509.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/73068293806.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/037144415bc4cca81e0f1b6f52a98143/96139401922.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/pafisoriditiru.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/69068258314.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/kuxasiserumulaxoruxubeni.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a370f1982da---lilawamuvoraxit.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d81f32be915---15154886813.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087d9dce3ff4---mexozojuvoge.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/dolopakisufidika.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/pufilikogenenoguwabozuw.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/serukitojegogulenebe.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/73346712725.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6dd82d93cb---91581588655.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/047d09596d6fe33373a7dd8ba5660be1/11097109767.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/dubawafenulun.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607de34b5f5c5---34253057022.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/zosejepomonunuwexomalefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=pokemon+liquid+crystal+evolutionsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ca6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA6A 2540 bytes
SHA-256: e02286a107db3a166ca8c7f7ddbb41cd58a6e3a019002f41c8faf61e3c8e0382
font_01_sfnt_off0001d57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D57F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ed96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED96 11052 bytes
SHA-256: 9e8fb420456e1df01f0727a67ba2b4abb716eb8c295eb1598bfada30b9cb5940
font_03_sfnt_off00020724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20724 18120 bytes
SHA-256: 3513301b0aefeaa0365e2688a801721f5d1b76cfe5ad5c6d2088695535c72f4a