Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d189c9526caadc3…

MALICIOUS

PDF

74.9 KB Created: 2021-09-12 23:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fb9952b819172ed551a4172aee331c51 SHA-1: 59e1cb3c481af056954554a27bec8619fac4b062 SHA-256: 8d189c9526caadc3e999cc341efde338113a4c84caa1f3a27aed1a3e084e9f63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many of which point to compromised websites or link farms, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://laborke.ru/uplcv?utm_term=how+to+make+a+tiktok+your+wallpaper+with+sound PDF link annotation
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nojabike.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/64354584033.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/38332767889.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613557a00d995---38137407464.pdfIn PDF document text
    • http://dytac.hk/userfiles/dulisekewav.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e05be3811---29161246768.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/83d3114b54adc48fb1a00216521d2d1c/70944938973.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/54431035711.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/66481864319.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/7731080332.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/89956425662.pdfIn PDF document text
    • http://teplospectr.ru/images/files/subewitopajame.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/86221429249.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/tipofowabape.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff2a5ddf6a---jafatavezosalifino.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/8702214102.pdfIn PDF document text
    • http://a-pluset.com/userfiles/48989172409.pdfIn PDF document text
    • https://aspirans.com/files/file/17614050877.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c5b40a615---kanipunalutazol.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/pididefatujakulojaxojoduw.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/zowal.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/20790861683.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/47202094952.pdfIn PDF document text
    • http://webursitet.org/Files/file/risanaxilapivimutigomek.pdfIn PDF document text
    • 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_off0000c118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC118 16732 bytes
SHA-256: 3ebe60aa60375e0b9b462d3963446f9de46f1ecd2efa8e7fd0422d14b1f1ea5e
font_01_sfnt_off0000ec62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC62 11040 bytes
SHA-256: 9cdbf921f1e53967e76ba09ad4bc91c8f867801fd678710d3e3cde43b4c6a5c7
font_02_sfnt_off000105e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.