Malicious PDF — malware analysis report

Static analysis result for SHA-256 b654d32cf40328aa…

MALICIOUS

PDF

77.5 KB Created: 2021-09-23 18:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1004a61f2ae921bc186d522c1c11facd SHA-1: 900c4883a1726c25b079d53888e663df5e477956 SHA-256: b654d32cf40328aa431b533e93fd4a36e8806baa5ab816354f8b03d2f106283b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning model indicated a high probability of maliciousness. The document contains a link farm pointing to various domains, some of which are identified as compromised CMS uploads, suggesting an attempt to redirect users to malicious content or downloads. The presence of multiple external URIs and link farms indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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
  • 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://wooshin.kr/uploaded/file/4258136356137265f95b8f.pdf In PDF document text
    • https://alternativecarrepair.com/userfiles/file/13379963326.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109040521019054.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/33825295307.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/latawedirafajeselexas.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/nogitajo.pdfIn PDF document text
    • http://proxima-online.it/public/file/92392914949.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/85431656291.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/1120595433.pdfIn PDF document text
    • http://decaiyun.com/upload/file/2109221958319846891lwesgje7rz4.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/81299875255.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/suruxoraf.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/wugesepeweted.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/vebivolozawudalomezulak.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/zajitiveluwuzo.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ad7f72355---dozufe.pdfIn PDF document text
    • https://datawire.gr/files/files/tikavusikexojejem.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5f5b70e2e---rimagufebebifozis.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/bamukotizedabogagukavi.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/16277337630.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/bexubulolonobubidijox.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/kekugufewunabibozinil.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143bea38bb2e---82687289251.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/dusetefulikuterijodumiduj.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/780234b07db8ed235b0cbfa83064fcf2/58831067820.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/lozexobakanabuwosoxim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=diggy%27s+adventure+apk+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B1 11060 bytes
SHA-256: 50a5b2e64ef6a19c6e17ea56b2f9376a371acaa2875983cb3025f6f332ef80b7
font_01_sfnt_off0000e380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE380 17356 bytes
SHA-256: 8bfc962160e7e5d0adb35ee053dbb011954b969f6577b5eff8f137e398940704
font_02_sfnt_off0001105c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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