Malicious PDF — malware analysis report

Static analysis result for SHA-256 152d553905298369…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 04:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bc250fd39fa4b8ed6fa37b92cdce0e08 SHA-1: ca3766d55cc101a8a998997f0466eb8c4c606f15 SHA-256: 152d553905298369665e8723f1c5c455f6ef0c1620a74517996a56cc7167a5ee
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were directly extracted, the structure and URL patterns are indicative of a malicious link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7899

Heuristics 5

  • 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
  • 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://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1608a12060528e---soxisifa.pdf In PDF document text
    • http://hzbmsj.net/images/upload/File/33297127057.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080ad0be3f53---14967562369.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202107090716523683.pdfIn PDF document text
    • http://asustainable.com/global/file/sitezodusemu.pdfIn PDF document text
    • http://fygl.net/uploads/file/27193017531.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/b32cb300d6314fb18e3884ff3936bbf8/95083688379.pdfIn PDF document text
    • https://medtek.vn/storage/file/xezar.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/5dcdc50ad4e6cd2719c0689c607a6ade/zubizanunotadoxerup.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a254d11dbd---titow.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/56934521626.pdfIn PDF document text
    • http://bougerpourstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/93534020319.pdfIn PDF document text
    • http://starlightcelebrates.com/clients/4/43/43e9139217482d7666ce300faf566241/File/81944869506.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/tufifasuzazugawuzeboda.pdfIn PDF document text
    • http://newcastlehigh1967-50threunion.com/clients/43248/File/gobafos.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608486d8ecb41---depafovotupobagixi.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607018854d24d---25763803258.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/40321591809.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/99302154047.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/3a7f816f737f30a6f311359575d86c73/81884550898.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e6ace08cc18---riwikapomi.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/kofegan.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/58681288659.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/86576975358.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=schaum%27s+outline+of+differential+equations+4th+edition+pdf+free+downloadPDF link annotation
    • 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_off0000ebfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10412 11404 bytes
SHA-256: c4c71ee1e1f0e76e45a3e476ad25812f75ba2b3f9ef25a20ee0d81c4e7353987
font_02_sfnt_off00011eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAC 18560 bytes
SHA-256: 2778b8aff13acd4c56eadfcdd14dd20739b107706186c8f71b2b06c8ce07009d