Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b7c23dd8bdc313…

MALICIOUS

PDF

79.0 KB Created: 2021-09-21 04:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f606d7fd56e6527840bf62772b45c518 SHA-1: 92a67656f6b76fdba987ca17c72d5ee763df7adc SHA-256: b8b7c23dd8bdc313c6e42b2c7dea711811bcef05973bd247538d0bec44a0d52e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous URLs pointing to potentially compromised sites or domains designed for hosting malicious files. The PDF structure and embedded URLs suggest it's used to redirect users to external malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8363

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://allytemp.ru/uplcv?utm_term=fur+elise+pdf+sheet+music PDF link annotation
    • http://goodfortune.hk/UpLoadFile/file///39192071002.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109192237169934.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/77056573518.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/rofudefikuroponevupuna.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614910fb08ffe---99849234461.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/nodofu.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/buwararad.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/noximezerob.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/furipojalominupeputor.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/25497412095.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/28273799256.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/67205547701.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/47048714847.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-8/20210908173205736164.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/welazijaxakakolekujid.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/50241901440.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/1df377b95508fafba2575a402ab90768/13781437354.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/gavekiwuriravaxipofamodi.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c549557287---ritup.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313cb668b91---98966633763.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613891bfd1603---jitazakofagotapugabapusin.pdfIn 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_off0000dc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47F 10576 bytes
SHA-256: e47f4e69da98201760cf80d7ec5f506b9a8f7864aaf0da8e835309e2c5d3e9fd
font_02_sfnt_off00010c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C94 17220 bytes
SHA-256: 2d4b690139a07cb9b86184f2650b319b924a8f99529edf1f19d4a35bb744d6d5

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