Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4b9009eded4720…

MALICIOUS

PDF

785.7 KB Created: 2021-06-23 09:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: dff87743bfe5e3e17bbe3f102b6a65fb SHA-1: 94bb83e14d19f5972170bffbe975a4b13d5a5b1f SHA-256: bb4b9009eded4720d52290d20a6db0008bc1aef97c7428885b6b25578c9562b0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing multiple links, many of which point to compromised WordPress sites hosting other PDFs. The ClamAV heuristic identifies it as a phishing trojan, and the presence of embedded URLs suggests a phishing or credential harvesting attempt. While no scripts were explicitly extracted, the PDF structure and URL farm indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier clean score 0.2129

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.
  • 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://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160799506157d4---xejezizemurizimev.pdf In PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16096a0286b4dc---fokunozafivawerifizi.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ce7f1ed4cec---dokuwurum.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/p59soietnfch60qj2m077elhp5/13195750002.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/l6vt6lr0bo0tpfhtvm4qcn98c2/mutivik.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/kabafumagufavopokomezoli.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2837ad6f5---vewalagikiva.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/d1063e72e52c2fb225b9cb021eda9feb/60506051793.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/jewew.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942bd13a33e---12865293877.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/17375082891.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/52968705656.pdfIn PDF document text
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/667ace39c61c9c3bc3868cf32bb3896f/98727579722.pdfIn PDF document text
    • http://prmakeup.com/Image/files/19333340940.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16098e8b823943---pomujusetedug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=sony+str+d990+manualPDF 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://scripts.sil.org/OFLIn 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
stream_016_off000b0858.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB0858 62360 bytes
SHA-256: b618918c2f1bdc28f53a8ee2229ec40ef5e8a8eb41b6810f62daf53b8cf36f63
font_01_sfnt_off000bc65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC65B 5472 bytes
SHA-256: dd51e36fd561ef913ee9d7d7eb3ce417a34539f67612bc7d6848b8e597eba081
font_02_sfnt_off000bd8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD8EC 23448 bytes
SHA-256: 9c970c3c1b2e01624ecfce5d0e7bff502ff6bbd1ae53a3e56388827d4cf6111d
font_03_sfnt_off000c1c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C93 16316 bytes
SHA-256: bffb1a1f3a6d0b61156f2d340f5ce00831c1e6b46cf0e5a0edccbb6de7acfec3